Adriano's place is really good, comfortable and fully equipped. It's a ~25 minutes walk from Santa Maria Novella station (a beautiful walk, I should say) or you can just take a bus that leaves you right around the corner. All within walkable distance, food and minimarkets just a few steps away. Didn't get to meet Adriano, but communication was seriously good and Cecilia received us and showed us around; she was great too. The upstairs bed might be a little hot (during summer, obviously) and the stairs to the apartment are quite narrow, but nothing too serious.
All in all, I would definitely recommend this place to visit the absolutely wonderful Firenze.