The appartment is great. The decoration is nice. It is very clean. Maybe a little bit noisy for the people who wants to go to bed early.
The location is perfect to explore all the city center by foot. The osteria right down the stairs is wonderfull, cheap and excellent for take away or to sit in but in the evening it is better to reserve because it's very very busy.
It is very close (right around the corner) to an affordable private car park (21€ the night).
If I ever go back to Florence I will stay there again for sure.