The Nest was a totally comfortable spot for my 2+ days in Florence. Most important to me, it’s extremely quiet (there’s no traffic noise at any time, and nothing heard from the rest of the building, with the other units appearing to be businesses). Wifi worked great, kitchen was fully-equipped (and Massimo left a supply of fruit and a few sweets ! ). Bed was particularly comfortable (nice and firm), with plenty of pillows.
The heat was thoroughly effective (weather was quite chilly during my Florence visit) and easy to control. Plenty of hot water in the shower (although as only 1 person I probably didn’t provide a severe test). Everything in Florence is easy to walk to (Duomo about a 15-minute walk from The Nest).
Massimo has compiled a helpful ‘handbook’, with instructions about using the facilities in the house, as well as directions to supermarket, restaurants, etc…
I tried to think of a few “imperfections”: it’s a bit of a haul from the train station, about 20 minutes with bags. If you were staying for a long time, the lack of a big ‘work table’ could become an issue, but for just a few days, the small kitchen table is adequate for eating, writing, and computer use. The toilet is somewhat of a 'side-saddle' arrangement, given the proximity of the shower stall (I've encountered similar circumstances in a few other places in Europe), but doesn't really present any challenge. There's a big-screen TV in the bedroom, with hundreds of channels, all in Italian, and not a one worth watching !!
Given these 'imperfections', I'd give The Nest an overall rating of 98 out of 100. If you're looking for a relaxing, cozy spot for your Florence stay, you can't do better than The Nest !