We stayed here for 7 nights and it was perfect for us. The location is within walking distance of all the key sights in Florence - Ponte Vecchio and Uffizi are 15 minutes away and the Mercato just 5 minutes away (a must visit for great food and produce). The Train and Bus Stations are just 10 minutes away which made it easy for us to visit other places, such as Siena and Cinque Terre.
The apartment itself was perfect too, in really good condition and clean, with a very well equipped kitchen which meant we could cook a little. The best part is the terrace - it is a real sun trap so we could have our morning coffee looking over the rooftops in the sun and sunbathe in the late afternoons too. The only drawback is that it is on the top floor and the building does not have a lift, so there are quite a few flights of stairs to reach the apartment- which may be a problem if you have accessibility issues/heavy suitcases!
Jacopo was really helpful ensuring we could have a good stay and even accommodated our late flight and check in. A great host.
Overall a great place to stay and I highly recommend it! :)