The apartment consists of three different levels (1. bath/living room, 2. bedroom, 3. kitchen) AND a beautiful terrace, so it's really spacious (and very clean!). Check-in with the mail box worked without any problems, and Raimondo and Alessandra are extremely nice and quick when it comes to communication via whatsapp.
The location is fantastic as well (in the midst of the city center and near a bus stop of the "Alibus" coming from the airport). This means that it can be a bit noisy at night, so if you are sensitive in this respect it is recommendable to bring some earplugs.
All in all, we enjoyed our stay at this place a lot and absolutely recommend it to anyone who plans to visit Catania.