Felicia's apartment is wonderful and exactly as described.
The hosts greeted us on arrival, and were very forthcoming with information and provided a tour of the apartment. The lady who owns the apartment is lovely, but has limited English so her son was present when we arrived and for check-out. We were running a bit late having driven from Agrigento that day, so the flexibility on our arrival time was appreciated.
The apartment is on the top floor and has a large balcony - we decided that having some outdoor space in our accommodation in Siciliy was essential, and this balcony is wonderfully sunny, with a shade for breakfast and generally pleasant feel all afternoon. The view is down towards the passenger terminal for the cruise ships. We saw several come and go during our stay. It can be a bit noisy in Palermo from the streets but we did not notice the noise inside with the doors shut. Plenty of air conditioning in all rooms as well.
Location wise, it's about a 10min walk to the really nice parts of town. We were happy to be a bit out of the center as we had a rental car and Italian cities have a low-traffic zone which means you cannot drive in at most times. Even still, parking is street parking and there are a lot of cars looking to use the available space. We were very lucky and managed a spot outside the building every time, but it could easily have gone the other way. There is a paid-parking garage across the road in the nearby side street if you want something secure.
Overall, a wonderful apartment, full of charm. Lots of interesting furniture - be careful if you have a toddler as we were constantly worried he would break a plate or something. There is a lift but it is very small.
I would recommend a stay here if you are in Palermo. We did two days in town and two days out at the beach, and the apartment was the perfect base for all of it.