Very pretty, but mobbed with tourists. And the taxi drivers are thieves.
Prague is a gorgeous city, especially if you like Art Nouveau. Very walkable, too, and great transit. And one of the prettiest synagogues I've seen in Europe. Not quite as impressive as Budapest, but in better repair--fewer bullet holes. On the downside, it's mobbed with tourists. And a taxi driver swindles me out of $100 by giving me "change" for a 2,000 Korun note in bills that were the correct numbers but were Belarusian Rubles, not Czech Koruns. I had just arrived & didn't know better.
Insider Tip:The taxi drivers in general are thieves: if you want one, get your hostel or someplace to call you one with a pre-set price. Otherwise the drivers on the street will literally charge you 4x what they would a local. Every time, unless you haggle.