We had a great time in Antonella's apartment. Rosinetta welcomed us for our arrival and gave us all the information we needed for our stay (incl. spots where we could park our car, nice places to visit etc.). The apartment is very lovely itself, peaceful, clean, and really in the centre of Florence : nice shops and trattorie all around the neighbourhood.
Be aware not to have back problems if you are 3 people : the folding bed is a bit hard to sleep on !