The apartment is ideally located, between the train/bus station and the historical center (5 min walking). The airport shuttle stop is in the same street. Although it's in the center, the place is very quiet because it's located in a courtyard.
Agatino was very kind to welcome me quite late at night and he even took the time to give me some advice for my trip. He takes care about the guest and makes sure that you feel comfortable.
There is a big living room, a separate kitchen (fully equipped) and a double bedroom and bathroom. Wifi is great and high-speed (it just takes some time to connect the first time with your device but then it connects instantaneously).
Just a small note : the Winter in Sicily can be quite cold and there is an air conditioning (hot and cold) in the living room but it is not enough to warm the whole apartment and the bedroom. But there are extra blankets in the closet, so you won't feel cold while sleeping.
Other than that, my stay in Agatino's apartment was perfect and I definitely recommend Agatino as a host and his apartement for you stay in Catania!