The apartment was very clean, modernly furnished and equipped with everything one needs for a couple of days. The location is terrific and very close to the centre of the old town (5 mins by feet). If you have a car you can park for free in the same street where the apartment is, although you might have to drive around a little until you find one.
When we came from the airport in the night with our car, Andrea was already waiting for us in front of the apartment to make sure we have a parking slot when we arrive. They were really thoughtful and helpful with all of our matters. At night, they would take us around the city if we wanted to and we had dinner togehter with the other guests, it was great. They also gave us helpful suggestions about the places nearby and in general information you can't find in a guide (bars, restaurants, etc.).
We would definitely book Abca's apartment again and can recommend it to anyone who wants to spend some time in Catania.