Claudio and Bibiana's wonderful apartment provided me with everything I needed for a comfortable month's stay in Catania. It's about 10 to 15 minutes by foot to Cathedral Square, as well as all the restaurant options that are in and around that area. There's a small supermarket and a couple of bakeries a few minutes away from the apartment, too.
Claudio and Bibiana are very nice hosts and are readily available if you ever need to contact them.