This place is incredible. Spacious, beautifully and comfortably furnished, super clean, well stocked with necessities. Very centrally located. Supermarket a few steps away. One of the best little Sicilian restaurants we have encountered is virtually next door in Piazza Olivella (Donna Eleanora--everything on the menu is great, reasonably priced and the owner is terrific). Parking on the street in front of the apartment is a bit hard to come by, so plan to park in Cagini Parking a couple of blocks away (15 euros per day).
As other reviews have mentioned, there is a young and partying crowd that gathers nightly at the bar next door and they seem to go all night. You won't hear them if you're sleeping in the master, but you will if you're sleeping in bedroom #2. Plan on using some white noise if someone is sleeping in there. We could not get the washing machine to work properly (it wouldn't spin the water out of the clothes for some reason) so we had to do laundry in a nearby coin op in a little kiosk on Via Roma. The host tried really hard to resolve the problem with the machine, but couldn't. Hopefully it has been repaired.
We loved our week in Palermo. So rich in history and culture, and we loved the gritty energy of the place. And I don't think we could have chosen a better accommodation. Andrea has created something really special.