My stay at Vanni’s was very pleasant. Vanni was very helpful and amicable. For example, when I noticed my outlet adapter didn’t work on his outlets, he lent me one that did the trick. He was easy to talk to and I enjoyed our conversations.
As for the mosquito issue others have noted, I just closed all the doors in the room and used the fan Vanni provided, and that was perfectly comfortable (keep in mind, the high temp during my stay was 34 deg C). Vanni also had other ways of dealing with mosquitos if you wanted to air out the room.
All in all, the room was great. If I’m ever back in Florence, I will be checking Vanni’s availability before anything else.