This was my first experience with AirBnB and I must say I had a wonderful experience with Mauro and Sharon. Check in is after 3 pm which didn't pose any problems and when I arrived I was greeted by both hosts who gave me the run down of the guidelines of the household (there is also a printed copy on the desk for reference). The room was set up the exact way it was in the photos except for the color of the walls which was blue instead of white. The bathroom was small trek down the hallway where you would enter lavatory which was also small but very efficient. Toilet, sink, shower looking from right to left and those are the essential items a traveler would need for hygiene.
Location of the flat is north of the city which is a short walk to the Central Station and other various places. The hosts also provides maps of the city which help out greatly compared to Google Maps or Waze. And if you like to participate in tours of the city, the flat is also by CiaoFlorence office. Only real negative of the room, which is stated in other reviews, is the street noise. Honestly, it wasn't that bad for me, the noise usually tapered off around 11 or 12 on Saturday and Sunday that I stayed. Overall, great experience! If I'm back in Florence I will definitely try to stay here again.