Francesco's place is great. Everything is within 15 minutes walking distance. The place is super clean and Francesco make sure AC functional during our stay (It was 96F outside). The building also has a paid washer and dryer which is very helpful since we packed light. his place has a queen bed in bed room with a sofa bed in the living room, which fit us (3 people) perfectly. But if there are 4 in your group, you might want to double check with Francesco, I am not sure if the 4th people will fit in sofa bed comfortably.
Overall, we had a very nice experience. Will definitely come back if we visit Florence again.