The apartment is great and as described by Rafaella.
The best thing about it is the location, just on the edge of the main centre and things you want to see - far enough away that it didn't feel crowded and we didn't have any noise issues from the street below. We had an 18mth child with us and it was great being able to take the buggy straight out and pop back for his nap, and after dinner for bed. The grocery down the street is really convenient and important, as Florence itself had less local food markets than we expected.
The apartment itself is really roomy for its location, has a lovely balcony over the river, and had everything we needed - including air conditioning in each of the bedrooms (it was 38-40C during our stay!), wifi, and a kitchen with saucepans etc for cooking. We were able to do our washing etc as well which was great, and Rafaella left washing powder, dishwashing liquid, salt etc so that we didn't have to purchase these little extras.
Rafealla met us on arrival and explained how to operate appliances etc, it is obvious that she takes real pride in her apartment which is nice. Other than that we didn't hear from her other than to organise departure, but didn't need anything.
Just a warning for those with a car - we drove up to the outside of the apartment in our hire car before realising that we'd entered the 'congestion zone' and therefore are likely to receive a fine. Also, we realised that we couldn't park outside, and the nearest public carpark was very expensive. We found a much cheaper option but it was 15-20mins walk away outside of the main central zone.
Overall I'd definitely recommend the apartment.