I'm an habitué of Palermo, and so far Federico's flat has been my best experience.
Firstly, it is in a perfect location to explore the city. The place is really comfortable, nicely furnished, and exceptionally quiet considering the zone.
The kitchen is well equipped, even for longer stays, and every room has dedicated air conditioner (a rarity in Palermo!).
But most of all, Federico is a very kind and welcoming guest, who will help with your every need and give you precious advice about the city.
Absolutely recommended, I'll definitely come back!