This summer, my wife and I are planning a 17 day trip through southern Bavaria and the eastern part of Austria (Salzburg & Vienna). Prior to this trip, I will be spending 5-7 days in Europe on my own. I'm 90% positive that I want to spend a chunk of that in Berlin, but I don't know that I want to spend an entire week there on my own. Where else should I go?
Here are some parameters to help clarify. We're saving Prague and Poland for a time when we can go together, I don't want to do southern Germany or Austria since we'll be there together, and I've already been to Switzerland (not that I'm opposed to going back, but there are so many places I haven't seen).
But given that I only have 7 days max, what are some other suggestions that anyone has?