WOW. This place is a jewel and I highly recommend it to anyone looking for a place in Florence.
The location is amazing. We often would begin and end our days by sitting out on the back patio and toast to the Duomo. It's also surprisingly quiet, considering how close it is to Tourist Central. (And btw, being able to walk out to the Duomo plaza in the early morning or late evening when all the tourists are gone is a wonderful experience.)
Even though we had seen the picture of the place (obviously) before arriving, it was still such a pleasant surprise to walk into a fresh, clean, beautiful, air-conditioned apartment. The bed was VERY comfortable. The shower was always warm, which was more than I expected for such an old building in a very old city. It really was the perfect place to stay.
Mary and Gio were also EXTREMELY helpful. We arrived later than expected, but Gio still met us at the apartment and made the time to talk us through the map he provided with all the other information. SO helpful. Mary communicated with me via the app about the fireworks for St. Johns feast day that would happen where best to see them. And the night before our flight left early in the morning, we contacted Mary about getting to the airport. She arranged a taxi for us to meet us at our door at 4am the next morning (which was difficult for us to do with no cheap cell service and only speaking English).
Highest recommendations to stay here. The place was perfect, and Mary and Gio were wonderful hosts. :)