I had a very pleasant stay in Marco Lucio's apartment. I haven't met him personally since his father welcomed us instead of him, but he was very involved anyway and gave me plenty of great recommendations. The apartment is clean and big and the rooms are comfy, the only problem might be noise from the busy street right in front so definitely bring your earplugs. It's a bit farther away from the city center and the seaside but still quite central so from there you can easily reach every corner of the city by foot. There's everything you need in the kitchen. I would definitely recommend this nice place for a trip to Catania!