I went to Bratislava in Slowakia a couple of months ago and I really enjoyed it. There are a lot of cosy little churches, old buildings (some of them with bullet holes from WO II) and some nice little restaurants. Board and lodging is very cheap
Eastern Europe is quite affordable. I would not worry about those things if I were you. You will spend more getting there in the first place (depending on where you live of course) and on the hotel (if you have a need for a better hotel).
I am also planning a trip over there, could you please tell me how much can I expect to pay to visit a museum?
And how much will cost me if I want to take pictures?
Eastern Europe is quite affordable. I would not worry about those things if I were you. You will spend more getting there in the first place (depending on where you live of course) and on the hotel (if you have a need for a better hotel).