I always say that that's like asking me who my favorite kid is!
Paris has always been my city. I've always felt strongly connected to it. Every time I return, I feel like I'm home again (though that goes for all of France).
I studied abroad in Florence, and I love that city so much.
Other places I love: Budapest, Capri, San Francisco, London, the Swiss Alps, Nice, Rome, Buenos Aires, Seattle, Prague, Montreal, my awesome city of Boston, and a very special place in New Hampshire called White Lake State Park.