According to forum posts, a popular itinerary involves spending a few days in Stockholm, followed by exploring the southern regions of Sweden, including Kalmar, Karlskrona, and possibly extending to Copenhagen. Travelers have suggested dedicating at least 3-4 days to Stockholm to fully appreciate the city and then renting a car for the southern exploration to experience the rich history and natural beauty along the coast.

Some travelers said that a mix of cultural and natural attractions forms an appealing Swedish itinerary. For instance, visiting historical towns like Vadstena and Söderköping, combined with natural sites such as the island of Öland and the picturesque area of Österlen, provides a well-rounded experience. Traveling by car is recommended for flexibility and accessing more remote locations.

For first-time visitors, users have recommended starting with Stockholm and then choosing either a northern route towards Umeå and Abisko for nature and hiking or a southern route through cities like Gothenburg and Malmö. The choice depends largely on the season and personal interests in urban or natural environments.

According to forum posts, many travelers prefer taking the train between Copenhagen and Stockholm. The direct SJ train is highly recommended for its convenience, eliminating the need for transfers in Malmö. This service typically provides a straightforward and efficient journey.

Some users have discussed alternative train routes that involve transfers, such as traveling from Copenhagen to Malmö and then taking another train to Stockholm. However, these options are generally less favored due to the additional hassle of changing trains.

Travelers should be aware of potential disruptions due to track works. For instance, on specific dates, trains might terminate at Stockholm Södra instead of the central station, but this is only a minor inconvenience as it's a short commuter train ride to the central area.

According to forum posts, travelers have several train options from Arlanda Airport to Stockholm. The Arlanda Express is the fastest but also the most expensive option. Alternatively, one could take a bus to Märsta and then a commuter train into Stockholm, which is included in the SL travel card, avoiding the high airport surcharge.

For many users, the Flygbussarna airport coaches are a popular choice, offering a direct connection to Stockholms central bus terminal. This service is seen as a balance between cost and convenience. Another bus route mentioned involves taking a bus from Arlanda to Märsta, then switching to a commuter train, which is a cheaper albeit slower option.

Some travelers said taxis and rideshare services like Uber are available, providing direct transfers to the city. However, these tend to be more expensive than public transportation options. Fixed price taxis are recommended to avoid overcharging.

According to forum posts, several travelers have inquired about overnight train options in Sweden, specifically mentioning routes such as Stockholm to Kiruna and Hamburg to Stockholm. However, availability seems to be an issue, with some users noting that sleeper carriages were not approved or that tickets were not yet on sale for certain dates.

Some travelers expressed difficulties in finding and booking overnight trains for specific routes like from Hamburg to Stockholm. It was mentioned that tickets for these routes might not be available due to regulatory approvals or scheduling issues. Additionally, direct links to book tickets were discussed, advising the use of official railway websites such as sj.se and vy.se for reservations.

In cases where overnight trains were not available, forum participants suggested considering other modes of travel. For instance, one user recommended flying as an alternative, given the complexities and uncertainties associated with train bookings for certain routes during specific periods.

Some travelers have noted that trains from Abisko to Narvik may not always be available due to repairs, and replacement buses are sometimes arranged. However, booking tickets for these can be problematic as the website may not permit it.

A taxi ride between Abisko and Narvik is frequently mentioned as a viable option, though many users warn that it can be quite expensive, even by Swedish standards. No specific shared taxi options or prices were detailed, suggesting limited availability or knowledge of shared rides.

Forum posts mentioned that a company named Visit Abisko might offer transfers to Narvik, but specifics weren't provided. Additionally, a new bus service by Kiruna Buss AB between Kiruna and Narvik was discussed, which could be considered for part of the journey if traveling from or to Kiruna is an option.

According to forum posts, Abisko is highly recommended for viewing the Northern Lights in Sweden due to its favorable weather conditions and low light pollution. Travelers have also mentioned Kiruna as a good location, being close to Jukkasjärvi and the Ice Hotel, which adds to the overall experience.

Some travelers said that Abisko can be reached by train or plane via Kiruna, with options for sleeper trains to enhance the travel experience. For accommodations, options like the STF Tourist Hotel in Abisko are popular among visitors.

Travelers have called out that the optimal conditions for viewing the Northern Lights include a clear sky, minimal moonlight, and preferably viewing during the solstice for the best chances. It's also noted that the auroral activity depends heavily on solar conditions, which are unpredictable.

According to forum posts, Uppsala offers various sightseeing options including Old Uppsala with its ancient burial mounds and the Uppsala Cathedral. The city is renowned for its historical significance with attractions like the Gamla Uppsala Museum that delve into its rich Viking history.

Some travelers have highlighted the availability of guided tours at key sites such as the Uppsala Cathedral and Gamla Uppsala. These guides are well-appreciated for their deep knowledge. Additionally, boat tours from Uppsala to Skokloster Castle are available in the summer, providing a scenic and informative travel option.

For those interested in self-guided exploration, central Uppsala is easily navigable on foot, making it convenient for visitors to explore the city's sights at their own pace. The area is compact and rich with cultural landmarks, which are accessible without the need for guided tours.

According to forum posts, Kiruna offers a variety of outdoor activities suitable for visitors. In the winter months, activities such as dog sledding and viewing the Northern Lights are popular. During the summer, hiking is a major activity highlighted by users.

Some travelers have mentioned that Kiruna is home to notable cultural sites, such as an important underground iron mine that can be visited and the town's church, which is worth exploring.

For those planning to stay in Kiruna, forum posts suggest considering the Scandic Hotel, particularly if looking to stay in the new city center. However, travelers interested in different types of accommodation such as Airbnbs may need to research more due to the town's shifting center.