In brief: very good value for money, very recommended.
As can be seen by the pictures (which are absolutely representative of the place), Alessandro's apartment is very unique, and has been an experience we very much enjoyed. The place is very clean, very spacious and offers a little balcony with a superb view into the spectacular trees and plants of the neighbooring park surrounding Villa Malfitano-Whitaker (visiting the park is highly recommended!).
For travelers with cars: there are parking facilities free of cost right in front of the apartment, which is a great feature in Palermo. At our next visit to Palermo, Alessandro's apartment will be our very first choice.