We stayed at Diegos appartement for a week and it was a really great experience. The appartement was very clean and super near to the market place and other hot spots. We loved the cosy roof terrace for breakfast and/or lunch and the big kitchen, which has enough space and everything else you need.
Diego and his father were super nice and had a lot of great tips for us (restaurants, nice places e.g.). The communication was very easy and we would definetly stay there again when we visit Catania. :)