The appartement is new, nicely furbished and comfortable. Everything looks exactly like in the pictures. Furthermore you will find everything that you might need in the appartement.
The location is central but in a bit of a 'shady' neighboorhood. (E.g. prostitutes at the parking lot at night)
Also there is a market from Tuesday to Saturday on the parking lot in front of the balcony and it gets really noisy around 6 am. Earplugs recommended.
The checkiner let us in after 8 pm (our flight was relocated to palermo, so we arrived around 11 pm) but they wanted a fee for giving us the keys.
Overall we had a good experience in Catania.