We stayed for two weeks in this appartment and I would recommend it as an excellent choice to visit Florence.
We had a problem during the first day (a half of the window blinds in the smaller room was missing, which made it difficult to sleep at dawn) and Sid immediately solved it. The kitchen was fully equiped, same as the rest of the house (no extra blankets or pillows were missing), albeit we would have appreciated a bit more attention on behalf of Sid regarding useful stuff for the house such as toilet paper or coffee filters.
The strongest features of this appartment are its location, just 5 minuts far from Palazzo Vecchio, Ponte Vecchio and the Uffizi, its size (specially that of the main room and the living room) and its terrace (with a sight of the cathedral's dome). Since it's located on a high floor, the appartment enjoyed little noise. The general state of the appartment is good and loyal to the displayed pictures, it's an acommodation with some old elements (such as the bathrooms) but kept in an excellent shape. The functioning of the heating is remarkable, surprisingly good for an old appartment.
The worst bits: the size of the bedrooms in the smaller room, suitable for children but a tad uncomfortable for two adults.
Finally, it is necessary to point out that it's a third floor without a lift and that there are stairs within the appartment, which would make it an inadvisable choice for elders with mobility problems.
Despite these minor flaws, I would choose this appartment again should I return to Florence.