I used to live in Florence and can confirm it’s an excellent location and excellent value for money. I stayed with two friends in this apartment for up to four people and we appreciated the big rooms, comfortable beds and two bathrooms.
In mid July is will be hot in the common spaces because there is no AC there, which is typical of Florence. In the bedrooms the AC did not make the rooms cold, but it made the rooms bearable. My honest advice is if you value cold rooms for sleeping highly then stay in a hotel which will accommodate that. It’s hard to find very excellent AC in Florence. My two American friends (from NY and LA) slept very well.
The check in and communication before, during and after was excellent. The washing machine, fridge and dishwasher were all used by us and worked well.
I would definitely stay at this Airbnb again, as it’s walking distance to all the sights as well as the non-touristy parts, with grocery store, pharmacy, bakery and excellent restaurants of all kinds on your doorstep.