I stayed at Stefano's for six nights, as I had a conference in Florence. I very much enjoyed my stay!
Pros:
-Extremely central location, yet it's peaceful and quiet!
-Michelle, Stefano's assistant, welcomed me to the apartment and she was very responsive and accommodating.
-There's a binder full of restaurants, gelaterie, and important sites that Stefano recommended, and I thought that was extremely useful.
-Washing machine! Enough said.
Cons:
-Lots of steps of varying steepness to get up to the place! Take heed!
-MOSQUITOES. I was eaten alive, and I have no idea where they came from.