We spent one week at Giorgio's wonderful apartment and the hosts were really doing their best in order to make our stay there comfortable. They have prepared detailed maps with advises what to visit in Catania, but also explained how to reach best beaches on Eastern coast of the island and get to Etna. For every our question we got immediate and full response. And that was really precious. A surprise was to find several bottles of Italian wine left for us. By the way, Giorgio and Nancy were flexible with the time of our arrival.
The flat itself has everything you need and air conditioning works perfectly (it's super important for Sicilian summer). It's actually a big apartment, separated in two with shared corridor. Both are totally independent. It's located centrally, but keep in mind, that public transport in Catania isn't really reliable - we've had an impression, that every one on Sicily drives a car or bike at least. If you want travel around Sicily and have Catania as a base - it's around 20 min on foot from Giorgio’s and Nancy's place to get to the central bus station, though central stop for the internal city's routes is close. Sure, bars and restaurants, most of landmarks are nearby. So I can strongly recommend stay at this place.