This is an absolutely wonderful location, in the heart of Florence, and the apartment is lovely: perfectly clean, well-appointed, and provided with everything you could need. It was a beautiful home and I would absolutely stay there again and recommend it.
It was extremely easy to organise checking-in, and Gianni not only met us at the door, he heaved my large suitcase up the eight flights of stairs on his shoulder like Superman, one-handed, with my friend's suitcase in the other hand, brushing off our attempts to help. He had great advice about where to find the supermarket, and the apartment had very helpful lists of contact numbers and a map of Florence.
Our only concern with the apartment was that we had no wifi for the entirety of our six-day stay in Florence. This is an internet provider issue, and not something Gianni or his sister could necessarily help, but every day after reaching out for an update we were told that the next day it would be fixed, and in the end we left without ever having a chance to use the wifi.