This is a great place to stay in Palermo! Totally self contained and feels just like a local home. Things I liked the most were the very friendly, helpful, and thorough welcome from the host, ongoing communication when needed, the air-conditioning or breeze (depending on the time of day), the fantastic kitchen (nice to cook at home after weeks of traveling), recommendations for shops and restaurants, the upstairs balcony for meals, the feeling of being a local, close to a supermarket and restaurants etc.
The only thing to look out for is the stairs. This is no problem for me, but for others it could be, the stairs are steep and there are about 35 of them, because the apartment is spread over three levels and not on ground floor. Like a lot of homes in Italy, this is built for small people who like stairs, not big people. Also, it's the old town so it looks a bit rough but it's actually very safe with lots of character.