This apartment is 5 star in every sense. We are a family of four (iand it worked perfectly for us.
Location is ideal, no more than 5 minutes from innumerable restaurants and a handful of blocks from the river.
The apartment itself has absolutely everything one can hope for; kitchen fully equipped, great sized refrigerator, kitchen utensils, Nespresso machine, etc.
The rooms and bathrooms are impeccable and of perfect size. Also, we visited in late July-early August and the air conditioning systems, both in the rooms and in the living room, worked great (even for US standards of cold).
The apartment also offers an ample gated parking garage which is very convenient.
Finally, I cannot say enough about the hosts. We arrived a day late because of flight issues and they were very accommodating, even gave us a voucher to make up for the day we missed (they didn't have to as it was not not their fault at all).
The hosts also provide a series of very useful short tutorial videos for getting into the building/apartment, using the washer/dryer, the parking garage access, check-out, A/C adjustment, vacuum, etc.
They also always responded within a few short minutes to every inquiry we presented, even once on a Sunday when we had a little trouble with the door (they had a contingency for it which worked like a charm).
If you are in Florence, you have to consider this apartment. We liked it so much we actually stayed in a couple of nights.
My full unconditional recommendation.