It was my first time visiting Florence and the location of this unit was better than I realized. It's tucked away a couple streets away from the Duomo and Baptistry. You'll hear some noise in the street from time to time, so light sleepers could bring ear plugs just in case. My wife and I stayed in the studio apartment which was clean, compact, was in a quite old building and was accurately represented in the photos.
Frederik was a wonderful host. He's an artist who paints, and from what we saw, he does very nice work portraying scenes in Florence. His art studio is nearby, which was helpful for checking in. He's very pleasant, offered good eating recommendations and helped get us oriented with the town. No hesitation recommending this place.