@CalamityJane,
I've not been to Prague, but Elise, an inveterate traveller, has been there several times. it's on her list so I expect I'll be there soon. It was spared most of the destruction of WWII (but not the architectural depredations of Soviet socialism), and, I've read, is avery beautiful city. Actually looking forward to it and interested in any tips you may have.
I do want to go back to Berlin and to Riga, both of which I found both very pleasant and (so far) endlessly fascinating.
In Berlin, Elise found the site of her grandfather''s old home - in Charlottenberg - rebuilt now, but one can get an impression from some surviving & restored structures in the area. (My grandparent's homes in Ireland were far more modest.) After some (fairly extensive) searching we also found a surviving concrete block GDR apartment building in Berlin - VERY low ceilings, dull and depressing. ugh ! The Germans have rebuilt and largely restored their (mostly) beautiful cities with remarkable skill. (One of the saddest contrasts I have ever seen was in the (now) Russian enclave between Latvia and Lithuania that was once East Prussia. Amidst all the dull, depressing stuff there, one occasionally sees a structure that is a relic of the earlier era - beautiful, but sad and worn. The people too - nothing like the cheerful, talkative Latvians, or even the more taciturn, but very pleasant Berliners.)