The negative reviews didn't seem to match up. The apt isn't dirty, it's just an old building. It's very pretty, it very much feels like Italy to me.
It wasn't loud for me either, but if it was it is incredibly centrally located, it should be pretty obvious that you wont be in a quiet area, haha.
The hosts were very helpful and generous and I wish I got to talk to them more but I was working and have a weird schedule.
It is worth mentioning for remote workers like me it's probably not the most ideal internet, a little slow and inconsistent.
It's very worth it overall. I had a great time in Catania.