Cettina is very nice. We had no problems to find the appartement and the communication was very good even if we had to switch very often between english and italian to talk (thankfully, my brother speaks italian).
The appartement is very well located to visit the old town. A little far from the beach (20 minutes walking + bus for 1€, it’s a little far if you only walk (45min) and Catane is not really walking friendly). We also were close to the train and bus station( 15 minutes by foot ).
A few problems happened during our stay: the appartement is pretty dark (lights must be on during the day) but climatised and it can be noisy at nights because of the street.