We stayed at Teresa's apartment for two weeks, the location is very central across Mercato Centrale,
and only a 5 minutes walk for the train station so very easy access.
Almost every monuments to see are quite near: San Lorenzo is the street next to it, the Accademia gallery is only 5 minutes as is the Duomo. Even the Uffizi and the Palazzo Vecchio are just a 15 20 minutes walk.
The apartment is spacious and clean with everything you would need.
There is air conditioning in both the living room and the bedroom.
Just be aware that the apartment is on the 4th floor without an elevator and there are quite a few steps. The noise from the market just below the windows didn't bother us too much, but because the apartment is very central you will have noise in the evenings and sometimes in the middle of the night.
Teresa was very nice checking in with us every few days.
We are very happy with our stay and would gladly stay in this apartment again if we ever came back to Florence