Location is spectacular, just half a block from the Cathedral of Santa Maria del Fiore and Brunelleschi's breathtaking Duomo. We loved strolling past the cathedral each day - it was especially magical at night. There are many great bars and restaurants in the nearby area, and our hosts provided a list of their suggestions which was much appreciated.
Communication with Lorenzo and his wife was excellent - they were very responsive and helpful. At one point we could not get the washing machine to work, and they very quickly came to fix it within 30 minutes!
Tip - pay close attention to the directions they provide prior to check-in. Google Maps points you to a location about 3 blocks from where the apartment is actually located. I didn't read closely enough and we did some extra walking trying to find the place.