As first time travellers to London, we found Days Inn London Hyde Park to be quite a good place to start with. It is conveniently located within 15 minutes walk from Paddington Station (15 minutes ride from Heathrow Airport by Heathrow Express, or if you're not in a hurry, 30 minutes ride via Heathrow Connect) and connects with Bakerloo, Hammersmith & City, District and Circle Lines (Tube). There are plenty of restaurants and mini-markets nearby (including a M&S Simply Food and Sainsbury inside Paddington Station). Many buses run along Praed Street (in front of Paddington Station) and there's a bus stop for Big Bus Company where you can purchase a 48-hour ticket to hop-on-hop-off its route which covers most major attractions in London.
On the whole, we felt the hotel was good value for money as the room was adequately sized with a decent bathroom and free wireless broadband in the room. Breakfast was good enough for us and the frontline staff were helpful when approached for advice and directions.

Small and basic but clean and good value for money. Suitable for city trips especially if you have no car, as the location is excellent, relatively central, well connected to train, buses and underground.

Very small basic rooms, small beds but clean. We had to change rooms when we got there because the room was so small and dark. Not designed for a long stay. Breakfast was quite poor and very basic even for a continental. The hotel was in a good central location. Parking was minimal.

It's a basic small hotel, but in a very central location in London, 5min walk to Hyde Park, 5min walk to Paddington train/tube station, plenty of coffee shops and restaurants nearby. So location and price we paid gets the thumbs up but the room was very small, breakfast was extremely basic and a bit of road noise. Not sure if I would stay again!