The stay at L'Aranceto Guest House was nice. Me and my girlfriend were visiting the city and this apartment was very well suited for that. The room was spacious and clean and the bikes provided by the guest house allowed us to see more of the city than we could've seen by foot. The host Domenico was around a lot to answer questions and was very quick to reply by phone to help us.
The only comment would be that the room we stayed in was a bit noisy. It was next to a busy street outside and next to the kitchen inside. The first is likely unavoidable in a city like Firenze and the later is only a problem when other guests use the kitchen in the middle of the night, even though it wasn't supposed to be used after 22:00.
All in all we enjoyed our stay and I wish future guests a great stay at Domenico's place!