First, hopefully Europe will be open by the late spring, 2021 to us Americans. We'll assume so, or my wife and I will change the dates to the fall. But basic questions remain. I am planning on mid May definitely not summer. We are middle aged but fit, like scenery and food, and architecture/cool places to walk around. Not hiking particularly.
So far I have us flying into Prague, spending 3 or 4 nights, taking a driver to Salzburg (Or an overnight train to Salzburg?) and staying 2-3 nights (2 full days). Then train to Vienna for 3-4 nights. Then home. Does that sound reasonable as far as timing?
The next question is Hallstatt. We can take the train to Hallstatt and spend one night then on to Vienna again by train. I don't mind the short stop and extra effort as we have a longer period in Vienna to rest up. But is it worth it--Hallstatt? To spend a night? Should we consider it as a day trip instead or is it too isolated for that? Or skip it and just concentrate on the three cities? Thanks.