The location of the apartment is excellent. It is in the middle of all attractions in Florence (the Duomo, the Uffizi Museum, the Academia Gallery,....) with a short walking distance. The only disadvantage about that is it gets quite noisy at night (we stayed there from Friday to Sunday). We have read similar reviews about the apartment and prepared ear plugs, which helped a lot.
Check-in and check-out were basically smooth and Cristina and Stella (who helped receiving us while Cristina was out of town) were both friendly and helpful.
The apartment is very charming with a regular bed and a stow-away bed, both are very comfortable. The only complaint about the apartment is that the air conditioner didn't work during our stay and we had to open the windows, which made the street noise even worse. Overall, we enjoyed out stay in Luca's apartment.