We stayed in Katane holidays apartment for 10 days with my family, 5 family members in total. Everyone had a great comfortable bed and we also had enough space. We had two balconies which was great. The air conditioner worked harmlessly! There's a supermarket right across the street. Only 1km walking straight to the piazza duomo and city center. There are good restaurants just around the corner. There are also good public transportation connections, but the busses don't have schedules in Catania so a car is definitely necessary so that you can move around the island easily. Giuseppe and Alessia were really kind and polite and welcomed us nicely. They even let us to do an early check-in which was excellent! Alessia speaks a bit English which was helpful, Giuseppe speaks italian but is although super friendly and communicative! We also got enough new bath towels during our stay and they offered an extra air conditioner when I asked for it.
In the end, our whole family was very satisfied both with the service and apartment! The price was also decent. Highly recommended! :)