We just returned from stays at Airbnb's in Venice, Sorrento, Rome and Florence. All of them were great, but David's place was hands down my favorite. As far as location goes, it's a fantastic neighborhood, close enough to the train station to be very convenient for day trips, but far enough away to be in a nice area. The Mercato Central is literally 2 minutes away (we visited every day). Everything is very easy to get to by foot and it's so easy to navigate around the city because the apartment is next to San Lorenzo, which makes it easy for a directionally challenged traveller like me to find my way home.
Communication with David was excellent and his associate Francesca met us at the apartment and she was informative, pleasant and warm. The apartment was spotless and in perfect condition, with lots of empty surfaces which are perfect for laying out your stuff and easily finding it again when packing up. The apartment was designed thoughtfully, with quality workmanship and with great attention to detail. The ceiling on the second floor was decorated with trump l'oeil coffers to match the design painted on the wall. We enjoyed having a washing machine, but we really enjoyed the dryer, which was a special perk as far as Italian appliances go.
The air conditioning was very efficient, both bathrooms were beautiful and roomy, water pressure was strong and hot water was plentiful. Beds were very comfortable. Great stove and fridge and there was even a nespresso machine for making your own coffee! It was my 4th time in Florence but definitely not my last and I would not hesitate to stay here again. It was a great experience and David was the perfect host.