We had a perfect stay at the Artist's Studio Duomo!!! Ulisse was very helpful and he was very flexible with our ever changing checkout times. We thought the apartment was looking better than the pictures with more light and even a small balcony. And we were literally couple buildings away from one of the major piazza's of Firenze!
Now for tips, the parking in the area was rather tricky... We didn't want to venture into the restricted parking zone with our rather bulky Citroen C4, so we parked at Parcheggi Becheria and walked for 10-15 minutes. We left the car at early night and picked it up in the morning, and we never paid more than 30 euros a night. There was a parking (parking Aurelio) on the same street as the apartment, but we didn't try to use it based on Ulisse's warning that they charge 2 days when you leave it overnight.