Florence is an amazing city. During our trip to Italy, my friends and I visited Rome, Florence, and Milan, and I think we could all agree that Florence was our favorite city of the three. Unlike Rome, Florence is small and has a much slower pace to it. There are definitely a lot of tourists, but it doesn't feel overcrowded like Rome did a lot of the time.
Insider Tip:Reserve your Galleria Academia tickets ahead of time. There is still a line you have to wait in, but it is a lot faster than waiting in the two hour line starting at eleven am that my friends and I waited in. Also, don't miss the sunset at Piazza Michelangelo. It's a trek to get up the hill, but it was easily my favorite part of the trip. Bring a picnic and a bottle of wine, and you'll be set.