Prague!
Prague is definitely one of the most touristy cities I've ever visited. In Old Town and New Town (which is still quite old), all of the stores seem to be geared towards tourists. There are TWO TGI Fridays! Yet even before visiting the neighborhoods of Prague "where people live" (as my hotel concierge said), I could already see how attractive this city is to so many people.
It really feels like fairytale Old World. Streets that don't run straight so you easily get lost, buildings painted in pastel colors, cobblestone streets.
I also think that the steeper the roof, the more magical and fantastical a building looks. Prague had no shortage of highly pitched roofs!