Vincenzo's a great host, very friendly and great communication, he accommodated an early arrival and let me leave a bag behind as my train wasn't until the evening.
The room and bed are huge, with a nice big window onto the street. Even though the flat is so central I didn't have trouble sleeping from noise. Some drinks and breakfast foods were provided which was a nice touch (though as coeliac I couldn't have any, story of my life).
The location is excellent, very close to the train station, walkable to all the sites you'd want to see, and the bus from the airport took about 40 min in quite heavy traffic.
Would definitely recommend staying here if visiting Florence