If you are planning to visit Florence, then you must stay at Alessandro and Azadeh's apartment! My wife and I had a wonderful experience, Alessandro and Azadeh are professionals and know how to provide first class service.
The apartment is literally right next to the Duomo! The apartment is large, has ice cold air condition, a living area, is extremely clean and peaceful at night.
They were very kind and allowed us to check in early and Azadeh provided us a detailed walk through of the apartment and great information about Florence. They are very responsive and easy to coordinate with. I highly recommend Alessandro and Azadeh's Airbnb!!!