As others have commented, this apartment has an excellent location and was very clean and more modern than other rentals. Most of the main tourist highlights of Florence's city center are within a 10-15 minute walk away, with some landmarks such as the Pitti Palace and the basilica of Santo Spirito being right around the corner.
There's great food around - just a hundred meters down the street is a little square with the 4 Leoni restaurant (great bistecca alla fiorentina!), the excellent Gelateria della Passera, and several cocktail bars. The square is lively at night with a mostly local crowd, and the apartment is close enough to be very convenient but far enough away to not have the accompanying noise.
Check in was very easy, the apartment was spotless when we arrived, and we had no issues with our stay. It's great having a small kitchen to store/heat up any leftovers. I would definitely consider staying here again on a return visit.