Guido was an amazing host, our plane landed at 10:30 and he was absolutely gracious with the check-in. The apartment was really nice, the balcony is charming and I was able to have coffee on it every morning even in January. The flat's location is perfect for visiting Florence, we never had to take a public transport and everything is reachable by foot. The three flights of stairs were not really a problem for me or my father so I would say don't be afraid of it unless you are traveling with a disabled or elderly person.
And if you like to cook, the kitchen has all the essential appliances and then some! We ended up eating in most of the time.
100% would book again, thanks Guido! Ciao ;)