Kind of agree with Heaton on the New York thing. Everyone seems to mention New York when they mention their favourite city, like there is no contest. Wouldn`t call it disappointing, because I liked it there and it has a lot to offer, but wouldn`t call it the best city I`ve been to either. I went during winter though, and went to LA afterwards(which I kind of preferred).
Most of the cities I`ve liked the best have been in Europe: Like Rome, Paris, Barcelona, Edinburgh, Liverpool, London.
I would like to visit more cities in Italy. Florence probably has a lot of potential. And Venice.