The apartment itself is nice, clean, quiet (the first floor underneath is inhabited and you have privacy), the overall design is pleasant and not crowded, although you have everything you can need in a vacation. There is internet, you can cook and wash whenever you want; the bathroom is also nice.
The placement is near the Ursino Castle, near the Old center of the city. A few minutes of walking and you can get to the fish market or the Borsellino bus station (from there you can go either to the beach or Acci Castello/Acci Trezza). It is actually preferably to take a bus to get to the beach, walking is not really safe or pleasant towards that side of the city. The other direction, however, is very nice, as you can see all the beautiful places in the Old Centre, delight yourself with shopping or good food.
The host was wonderful, very responsive and polite. She helped whenever it was needed and explained everything about the apartment well.
We had a great time in Catania, as there are many places that can be seen (walking, by bus or using trips). The food is great, the sights are wonderful and the beaches with lava rocks are exquisite and unique.