Having stayed in several "luxury" AirBnBs, I can say this one blew us away!
The apartment is elegant yet comfortable, central yet quiet, modern while classic. The host has fantastic taste in furnishings (think Roche Bobois, not IKEA). I agree with other reviewers that the apartment is even nicer in person than in the beautiful photos.
The apartment is within a well-kept, quiet historic palazzo. Everything functions well (not always the case in Sicily!). Dario arranged parking nearby. There is a washing machine-dryer in the unit. The air conditioning functions very well.
The location is very convenient -- right near the main post office on Via Roma, an easy walk to the key sites and La Kalsa. Dario and his team were a pleasure to work with.
In short: When we return to Palermo, this will definitely be our first choice!