Perhaps the best thing about this flat is the location; you're just minutes away from great bars, restaurants, markets, and a bunch of different sights. Most major attractions in Palermo — including the Norman Palace, the best squares, museums, and so on — are in easy walking distance, and it really makes the whole stay very smooth. Angelo is also a great host; extremely conscientious and helpful. And his cousin Marco gave us trips back and forth from the airport, as well as lots of advice and chat about Palermo and Sicily in general. Really pleasant guys.
The flat itself is comfortable, clean, and quiet. For the price, we thought it could have been kitted out with some more kitchen equipment, though. There's enough space to cook but basic items (like a cheese grater for example) were missing, and some utensils (e.g. the kitchen knifes) were cheap enough to be difficult and annoying to use. It's not a big complaint, but it was an annoyance. Some of the door handles also have a tendency of falling off and we had a bit of trouble with the boiler, but a plumber came round and fixed it, no problem.
These were only small complains though, and overall we'd definitely recommend staying here.