Very nice location, close to the main points of interest in the city. Nice neighborhood, close to what I believe to be one of the best restaurant in town : "trattoria Cesarino".
Francesco's apartment is a very good value, it's very well equipped and very clean. The only flaw is that you can hear some noise coming from the buses on the street.
But on the whole it is a good experience and great place to start your visit of Florence.