Very modern and comfortable apartment in the center of town. Very close to tourist attractions, as well as restaurants, coffee shops etc.
Check in was good - there were two people still cleaning the apartment when we arrived but that was not an issue as we left our bags and went for a short walk. Apartment was large, airy and spotless. Beds are very comfortable. Given the location, you should expect some street noise - not a problem if you live in Manhattan but may be felt if you are used to complete silence when you sleep.
Andrea was very responsive - at one point I contacted him to get an extra towel and laundry detergent (the washing machine / dryer was very welcome as we stayed 6 nights), and he had the items delivered promptly the next day.
Would definitely stay here again when in Florence next - recommended.