I am very happy with my stay at the Tornabuoni apartment manages by Keys. My girlfriend and I were in town for a wedding, and this flat gave us the space, comfort, cleanliness and location we needed to enjoy all Florence had to offer. I highly suggest staying here — the check in/out process was smooth and easy, the wifi, AC, washing machine all worked perfectly. I will be back.
Note: we are young healthy 30-year olds. There is no elevator, and the flat is a few flights of old school Italian stairs.