5 stars all round!
Be warned that if you stay in the Botticelli room (as I did), its doorway is low and the shower cubicle in the en-suite bathroom is very narrow. But even with these minor things, the 5-star ratings I've given are well deserved. Valentina gave good instructions before arrival, and she also has the place very well organised. And as a Brit, having English tea bags available on arrival was a very welcome sight.
And as a location, I'd give it 6 stars if I could. Superbly located, convenient for the central market, the railway station, a supermarket, the Galleria d'Accademia, the Duomo, etc.
If and when I return to Florence, I will first check to see if I can stay here again!