I really enjoyed my stay in Gianmarco's apartment.
Other than requiring a bit of a climb (5th floor! So you get your daily exercise), the apartment is easily accessible and located centrally within short walking distance to both Santa Croce, del Fiore and the uffizi. The neighborhood is filled with cafés and restaurants, so it's easy to find a meal or snack at all times during the day. The apartment itself is spacious with all necessary utilities as well as nice and cool even when it's hot outside.
Gianmarco is friendly and welcoming, and I had no trouble communicating with him before my arrival.
All in all highly recommended!