We had quite the adventure once we reached Florence. Long story short - we met the wrong AirBnb host outside of Claudia's apartment and we mistakenly followed her to wrong apartment. Word of caution - make sure you clearly hear their name before you head up! This was totally our fault and Arianna (Claudia's sister I believe) was so gracious when we called her a few minutes late after we realized the mix-up.
Once we got into the right apartment all was well. A wonderful bottle of wine was waiting as a gift (much needed after that experience.) They had everything we needed for our stay and since we packed light we even took advantage of the washing machine. The location is ideal - right in the middle of everything we wanted to visit. The bed is lofted and the stairs are a bit tight so I would recommend only booking this apartment if you are spry and don't have any concerns getting up/down narrow stairs.
Finally, the only downside to our stay was the temperature in the apartment. We had the A/C and fan on but it still was sweltering as we slept. We just happened to stay here on one of the hottest weekends all summer so don't let this stop you from staying here. A normal summer night would not have been so bad! That said, I would try to visit in a more temperate time of year if you can plan it that way.