The flat is very central, extremely convenient for all the places you want to visit (including the best gelateria in Florence, at the end of the street!). It's very clean, comfortable and well-equipped, and the photos give a precise picture. It is refurbished and decorated with great taste and style. Grazia was very helpful before we arrived, and Marco was also very helpful when we were actually there.
In my opinion it is most suitable for a couple, because the sofabed is in the sitting room/dining area, which overlooks the street: this can be noisy at night (those motorbikes!). The bedroom overlooks the back, and is very quiet.
However I would most certainly recommend it for anyone visiting this beautiful city, and hope to return before long.