Jeanne and I stayed in Mabbi and Luigi's penthouse apartment for a full week. Our exprerence was superb in three respects. First, the apartment is an idea location for exploring the heart of Palermo. It is within a short walking distance to the main pedestrianized avenues crossing the "old city" and also some of its key historic and cultural sites (e.g., the Palatine Chapel, Teatro Massimo, and Capo "market"). The apartment is also near city bus stops and the ticket office for the regional bus system. We stayed out until 11:00 each evening but always felt very safe returning to the apartment.
Second, the apartment suite is wonderful and was more comfortable than staying in a hotel room--and, of course, much less expensive. It was very clean and tastefully decorated. The bed was comfortable, the kitchen had everything for cooking and dining, and the modern shower had great water pressure. The apartment is surrounded by a large terrace that overlooks the city. With very comfortable chairs, it was idea for relaxing over wine at the end of the day. Also, the apartment is quite secure. We had keys to an outer gate, the building lobby, and the apartment itself.
Third, Mabbi and Luigi were superb hosts. Before and during our visit, one of them always responded promptly to any questions or requests that we had. Mabbi was there to welcome us when we arrived and provided water and special pastries. She provided us with information that let us get settled that evening, e.g., a local grocery store and a neighborhood restaurant. Also, they helped us with arranging a taxi (with their "trusted driver") to pick us at the airport, drive us to Monreale early on our first full day, and drive us back to the airport for an early flight at the end of our visit. I don't know how we would have managed the latter two items without their help.