We stayed with Stefano for one night but wish we could have been there longer. The apartment is beautiful--it feels like you are staying in a museum which is a very cool experience in and of itself. The location is amazing! Florence is very small and walkable and this hotel happens to be in the center of all the major sights. It is even walking distance from the major train station (SMN). The room is very nicely decorated, clean, and comfortable. You have your own private bathroom. In fact, for those that may be concerned about privacy--it is not an issue at all. You basically have your own little space in this beautiful apartment.
Most importantly, Stefano and Ralph are such gracious hosts. They answer questions, provide recommendations and are overall just interesting, intelligent and delightful to talk to. They were also very accommodating. We were not leaving until late the day we checked out and they held our bags for us and we just arranged a time to meet and pick them up in the evening.
This was my first time booking something through air bnb--I usually stay in hotels and can admit that I am somewhat of a hotel snob and like to stay in nice places. After staying here, I realize the wonderful experiences I could be missing out on! Plus this apartment is probably more comfortable and more beautiful than any 5 star hotel in Florence. I will definitely be recommending this place to all of my friends.