What a fantastic apartment! At times we just sat looking at the simple lines of the walls and ceiling, soaking up the history of the building that has been there since the 16th century. On a practical level the flat is fine - no luxury but everything works well. We cooked in the kitchen and eat breakfast on the small internal terrace.
The other great thing about this apartment is its location - on the edge of the touristy centre but in a good residential area. Cappuccino down the street was €1.10 - in the centre it was €3.50 to give you an idea. Splendid food market nearby for fresh meat and veg. Would definitely come back here when next in Florence.
Lastly - the hosts. We didn't meet Caterina who was away but her father in law and the housekeeper were so friendly and helpful - even when we arrived at 1 30 am - 5 hours late because of the storms in the area.
Overall a great airbnb experience.