The space was clean and well appointed for a week-long stay. We needed to arrive late, and Maria Theresa arranged for us. She also helped us find an apartment for a single night with her friends, when we returned briefly to Florence before flying home.
We loved the location (walkable to nearly all sights) and the energy and activity in the square - even getting to join in line dancing with a group one night. The noise is regular each evening as described by others, but added to our experience of this bustling city.
The apartment is on the fourth floor (up three flights) with high ceilings and a view of the piazza. One thing that could have been clearer in the description is that the second bedroom is a loft room above the first, so effectively one space on two floors. No real privacy from your housemates if desired. Not a problem in our case, but good to know.
We thoroughly enjoyed our stay!