Diego's place is in a perfect location for exploring the center of Catania. Most everything of interest was within a 5-10 minute walk. The Bellini garden 15-20 and the train station 20-25. Many excellent restaurants in the neighborhood. Diego and his father were super hosts, always checking on us and helping. The place was well-stocked and clean.
The only caution would be for people who don't climb stairs. But if you can manage the climb, the view of Etna and the city can be spectacular from the rooftop terrace.
Communication was beyond expectations, and every question was answered quickly. When we return to Catania, we will definitely stay in Diego's place again. Recommend!