As nearly impossible as it is to choose a favorite city, I think Florence is mine (with Rome in a very close second place). I love all the history that is rooted here: from the Medicis, to the many architects and artists, old palazzi (palaces), and famous writers such as Dante and Machiavelli. This city is, after all, home of the Renaissance.
There is so much to do here almost overwhelming. One could spend a month in Florence visiting museums, churches, and landmarks and still not see everything!