@abdullahkahraman You are doing the trip I did in 2008 or so, but in reverse order.
My advice is: spend as little time in Prague as possible, it's way too touristy. Be prepared to spend $$$ (sorry no euro symbol on my keyboard) in Vienna. Budapest was by far the best experience of those three cities for me.
ez.analog.com/thread/84767 just bit me in the butt sorta hard. Spent two days trying to figure out why the inputs on my ultra low noise IA were pinned at rail.