The flat is very nice, clean, well equipped and situated (15-20 min to center). Carlo was very disponible at our arrival even if we arrived earlier.
We parked our car in a parking via B Varchi (20€ / day).
The only little disagreement is the noise in the room, which can be a problem is you're sensible. But this forced/motivated us to wake up early to visit Firenze, which was good :)
We recommend this appartment and also the 'trattoria giapponese' in the same street.