Our suggestion is to look for any accommodation (hotels, B&B’s, apartments for temporary tourist use, etc.) in lively neighbourhoods downtown with good transport connections, for instance nearby Via Etnea.
There are plenty of cozy B&B’s in Catania and most of them can be booked on the most commonly used web sites, such as:
More information on accommodation can also be found on VisitSicily (from the Sicily region).