We really enjoyed our stay. The apartment is in a great location and very central. There was noise from the street and the apartment above, but ear plugs helped. Also, there is a mosquito problem in Florence, so bring bug spray. This is not an issue due to the apartment, but with Florence.
The beds were comfortable and the place was clean. The hosts were helpful and responsive.
The only thing I'd suggest in supplying a coffee machine. They do provide instant coffee and there is a nice bakery below, but that was the only thing I felt could've made the stay a tiny bit better.
I'd stay there again in a heartbeat.