The apartment is ideally located in the old city center, within a stone's throw distance of Uffizi and Palazzo Vecchio. The building it's part of is quite old but the apartment itself is in good condition. As mentioned in other reviews, the stairs are quite steep. Nothing that a healthy reasonably fit person will find problematic but heavy luggage will complicate things.
It works great even for extended stays for 2 persons (there's place for more, but I expect privacy would be an issue). Would definitely stay here again for future trips to Florence!