Our experience in Elisa's loft space was absolutely wonderful. The apartment is very clean, beautifully designed & appointed, spacious, and has all the creature comforts you need for a short stay. The bed was very comfortable, the wifi worked fabulously, there are plenty of outlets and convenient surfaces, as well as storage spaces (drawers, hangers, etc..) and perhaps most importantly, the location was perfect. On the same street it's only a short walk to get to the Palazzo Vecchio (and then everything else), and to turn the other way, there are wonderful restaurants as well as a convenient taxi stand to get back to the airport.
Upon arrival, Elisa's father was there to greet us, show us how the keys/doors work, and everything we needed to know about the space. He even helped carry one of our luggage bags up the stairs! He was also there to help with check out on the day of departure.
Everything about the experience was just wonderful. The only comment we wanted to make is that sometimes, very late at night, you can hear some rowdy exchange students through the (somewhat) thin windows. It's really no fault of the place, and was minor enough for us, but could potentially affect those who desire more a more sound-proofed experience.
To conclude, the space was perfect, and to top it off, there were a number of small little treats for us on arrival (drinks, snacks, candy, mini-pastries, bottled water) that just made the welcome really terrific. What a host!
We would highly, highly recommend this to anyone staying in Florence.