Working with Paolo was a great experience. His air BNB is located right near the Santa Maria Novella square. This was great because there were many places to walk to, but also a taxi drop off station right by the square (these are sometimes hard to come by).
The apartment was air conditioned and soundproof to outside. We stayed on a Friday night so the street was rather noisy, but the nightlife didn't keep us awake. Paolo was flexible to work with us on our check in time, as our train arrived later than we hoped. He gave us a map of Florence and pointed out favorite shops and restaurants.
Great experience!