There was some noise during our five day visit in March 2016 because the apartments were being renovated. The hot water wasn't always very hot, the wifi wasn't reliable, and the heating went away for a day. But the owners were friendly and helpful, and went out of their way to accommodate extra requests we had, and help with ticket booking and advise about local museums.
The apartment is large, beautifully decorated, has a kitchen, and is in a central neighborhood. The train station, the major sightseeing area, and several good restaurants, are all within a few minutes walk.
We loved the apartment, and if/when we return to Florence, we'll stay there again.