Family (50something parents, 24- & 14-yr-old offspring) flying in & out of Frankfurt (tix already bought), and planning to spend 12 days in early June 2015 in southern Germany/Bavaria and Salzburg and, possibly, Vienna.
We tend to like a mix of urban/pastoral and like to stay in one place for a few days at a time -- a local apt in the heart of things -- and enjoy a mix of historic/cultural/outdoor/shopping/dining activities in walkable settings.
We'll probably rent a car but would also enjoy some train travel.
Is Vienna for 3 or 4 days too much to fit into our itinerary? Is Munich a good alternative or are both possible?
Other sites we're interested include Dachau, Rothenburg odT, Nurnberg, and Bamberg.