We stayed at Adelaide's apartment in Catania for 5 nights. The apartment is as shown in pictures, very compact and probably would be a squeeze for 4 adults especially to eat at the table. It was super clean, but used highly scented products so those with perfume sensitivities might want to let her know before so she can use more neutral products.
It is lower than street level and right on a railway track (can't hear if blinds are down) and right next to a small elevator which when in operation can be heard from the bedroom. There is only a in apartment drying no outside or electric drying facilities.
We knew it was outside of the main city core and consequently there are very few restaurants nearby - be prepared for a walk of about 25 minutes to downtown and the very active and fun Fera 'ô Luni daily fresh food and 'all things clothing and household' market - definitely a must see. We did not use the bus system but think you can get a bus to Etna from the nearby square which is about 10minutes a way with a 'Deco' supermarket which was the best we found in the area, there is also a Panifico bakery a block away that has delicious bread.
The road the building is on is busy and therefore free street parking is a very big challenge (as in most cities in Sicily).