We spent in this apartments for a week and were very satisfied with location. There is literally 5-15 minutes of walking to the most interesting places in Florence. In the same time no any noise from the street inside.
Bed was comfortable, kitchen was well-equipped, communications were also smooth. We were also happy to see the bathtub - usually there is a shower in apartments.
From the cons I can mention the apartment is quite dark and you have no window view at all. This is not a big deal if you spend most of the day outside, of course.
Also A/C power was not enough when there was a 34C outside, but as I know such warm weather is kinda unusual thing - probably this is not a big deal in other seasons