We spent a few days in June here. The apartment is filled with statues and art on the walls along with descriptions of some of the works - very unique. The elevator up the 2 flights was very helpful. We had difficulty with the air conditioning and needed to shop for some basics (soap, trash can liners, toilet paper) which is not what I usually experience with AirBnB. The best aspect of this apartment is the location. We had an easy walk to all the sights, shopping and food.
As a side note - if you want an interesting walk take a bus up to Fiesole and walk back the 4 miles downhill.