We really enjoyed our stay at Guido's apartment. Guido seems to be a good host, available when needed but keeping a discreet distance even though his apartment is next door. He was away most of the time we were there but he did leave us a number we could call in Florence if needed, however we were fine.
The location of the apartment is excellent in an old building in a tiny street opposite the police station. The apartment was clean and spacious despite only having one main room. It is less than 5 mins walk from the Piazza Signoria, you can see the tower from the window. It is also only 5 mins walk to the supermarket which is just the other side of the Ponte Vechio. Being so close to everything meant it was easy to drop in to the apartment for lunch or a break. The bed is very comfortable and having the lift was great as the apartment is on the 4th floor. Not having to climb steep stairs with luggage or shopping or after a tiring day of sightseeing was much appreciated.
The only slight downside was the street noise. We think we were unlucky on the first two nights as there were football matches as after that it was much quieter in the evening despite being a weekend but we did find we had to keep the windows closed at night which was fine in late October as the apartment itself is airy and spacious but might be a problem in the summer. There is also street noise in the morning as Florence wakes very early but that wasn't a problem for us as many of the museums open at 8.15 so we wanted to be up early anyway.
The other huge plus about this apartment is that the Trattoria Nella is only a couple of doors away, a small quiet traditional trattoria with wonderful food, especially the pasta and the pane cotta with chocolate sauce. Good size portions as well. However book in advance in high season as it is small and obviously popular both with locals and visitors.