We stayed four days in Palermo and the location of Angelo's house is fantastic, right in the historical center, within walking distance from almost everything! (We only took a bus to go to Monreale)
You can walk to historical landmarks, teatro Massimo, and restaurants...
The house itself is an old home completely refurbished and decorated with taste and care. Stop and look at details! The hand painted ceilings in the bedrooms are beautiful.
Angelo, the owner, is always available (answers any message instantly, I wonder how he does!). Furthermore, he seems to be a very nice person, genuine and kind. He gave us addresses, restaurants, advice, and more.
The only difficulty we had is the noise. We're an older couple and we didn't feel like going out to join the party. And Palermians can be loud.
But overall, we had a great experience.