Despite not speaking much English, both Innocenzo and his wife were incredibly hospitable and gave us many recommendations. Their apartment was spacious (even for our group of 7) and had a large living / common area so we could all hang out when we wanted. The two full bathrooms are also modernly renovated.
The apartment itself was walkable to most of the main attractions in Palermo except for the Catacombs. Because it is located so centrally, it can be a bit noisy with traffic, but otherwise we had an excellent stay. Would be perfect for a group of friends or a couple of families - would definitely recommend.