This review is based on a two-month stay (October and November). My wife and I visited alone, except for a few days when we had a single friend as a guest.
The apartment is not large, but the space it occupies is configured in an optimal way, with two proper double bedrooms separated by the living/dining area, and two bathrooms, though only one with a bath and shower. The living area has a comfortable sofa and two armchairs and in general the apartment is well furnished and equipped. There is no view as such, but the windows are large, the ceilings high, and electric lighting quite adequate. My wife would have preferred a more modern kitchen, but it is functional, with a proper stove, dishwasher, and washing machine. There is an elevator, which we never used except on arriving and departing with our heavy suitcases, since there are only a few steps up to the apartment.
The location is perfect, affording easy access to the main attractions and situated in the best area of the city for shops and restaurants.
We have considerable experience with renting apartments in Florence, having stayed at about a dozen places for one month or more over the last 30 years. It is a real challenge to find places that are relatively quiet and private in the middle of this busy city. This apartment is certainly private. The only occasional noise we heard within the building came through the kitchen window (which we preferred to keep open for ventilation) from the interior well, but closing the kitchen door took care of that. A certain amount of noise from outside is inevitable, with windows only a few yards from the Piazza Santa Croce. Some nights there were very loud young people in the street outside. One of the bedrooms has double windows that block most of it, but I would recommend that light sleepers - wherever they stay in Florence, for that matter - take ear plugs. I did, and didn't lose a minute of sleep.
The weather in October was perfect and we only needed the heating in November. It worked well and we were never cold. There is only one air conditioner, in the living area, but it was sufficient on the one and only day we needed it.
Overall, we found the description "cozy and elegant" very appropriate and we really enjoyed our stay. Massimo and Antonella were excellent hosts in every way!