Firstly the plus points of this unit:
1) location is very good
2) easy walk to groceries, food and points of interest to visit.
3) the small patio outside is perfect for breakfast
4) you have all the utensils one needs for cooking
5) Francesco is very easy to communicate to and he had someone over to help settle me in even though he was travelling himself.
As for the negative points:
1) it overflows easily after each shower and the toilet floor is wet and slippery as there is no proper drainage area outside of small shower area. We didn't see any floor mat either so that means it can get a bit wet outside bathroom as well after 3 person has gone to shower.
2) Do note that it may be a bit harder climb for the elderly to go up the stairs with luggage to the unit and also the stairs to the bedroom. That was ok for us though as a young family.
3) amongst the 6 places I stayed overnight at in my Italy trip, this is easily the most dusty place we stayed. It is not dirty per say, but can be upkept better I feel.
Generally, if you have to rent a car to drive in Sicily, try to get as small a car as possible. The roads are very narrow and it can be quite hard to get parking nearby. But this is in no fault to the unit as it is the same all over Catania.