The appartement is well located, form the city center, clearly a good place if you plan to move out more that staying home. We were three there, (shower clean but really tiny) and I will say it is ok for a week end, depending how space you used to live in, and how organized you are :)
It was clean and safe, we do not have any problems. Yuri was there for us before we arrived, and manage his time to help us, also a good communication for tips all the week end long.
For those who comes with a car, not too difficult to park, except late night, like everywhere else, so better to come early and go have a gelato and a nice walk !
Enjoy your stay, Sicilia is amazing !