Serena's place is truly amazing. I've stayed in many great Airbnb places, but Serena's apartment was--by far--one of my favorites. The apartment was spotless clean, nicely furnished (the pictures really don't do it justice--it looks much better in person), and the location/kitchen window view (the Duomo!) just can't be any better. Serena's husband was also able to accommodate my early check-in request and got back to me very promptly to answer the questions that I had. I would definitely try to stay at Serena's place if I were to visit Florence again and can't recommend it enough.