Maybe it’s a wishful thinking, but I would like to run this itinerary with massive transportation, starting from Bratislava a Tuesday afternoon in July at about 17:00 and getting back to the airport on 15:00 next day.
The initial thought is to travel from Bratislava to Vienna Hbf, and then to take a train to Melk. Stay overnight there as it appears that the hotel rates are better than the rest locations, and have a sightseeing tour till it gets dark. Next morning wake up early enough, do the rest of Melk, and jump to a train, boat or bus (boat sounds the preferable choice to enjoy the area), to Durnstein. Walk around there, till I catch up a train/boat/bus again to Kerm. Stay again there for sightseeing, and then get a train/boat/bus again to Vienna Hbf, or preferable directly to the airport.
I would appreciate your advice how to effectively use massive transportation for this short trip, and the amount of time to budget for each of the 3 villages (if you also recommend additional details on what to see in each of them, it would be perfect)
Thanks in advance