I have had some amazing experiences with airbnb, but rarely have I come across such a gem. The host was responsive, helpful, and clearly cares about her guest's experience. The unit itself is quiet and safe. It has recently been refurbished. It is well lit with beautiful floor to ceiling windows. I have never encountered a better equipped kitchen in an airbnb unit. The neighborhood is just off the main street of the Old City. It is within walking distance of everything you could possibly need.
I highly recommend Fiorella's listing, and I will definitely stay with her again on my next trip to Palermo.