This is the place you want to be when you stay in Catania. I stayed here in early June 2018 for my second trip to Catania (I previously lived in Catania in summer 2015 for work). I know the city well and can say certainly that this apartment is in a fantastic location and it is a terrific choice.
Right next to the city's trendiest new restaurants and lounges, you can walk anywhere or walk to the brand new underground Metro (recently re-opened) to get to the train station or far parts of the city. The apartment is a fully furnished place that is just what the locals live in - you will feel like a member of the city, not a tourist. Below you at night will be locals going about their daily life and you can walk to the fish and flea markets, bakeries, pharmacies, food stores, and be right in the mix of the vibrant night life.
The place is perfectly clean and all utilities worked as promised. Large windows and several balconies to walk onto to look out over the city streets.
Please note: the night life below is busy and the locals eat late into the night. There was no trouble, but if the sounds of talking affect sensitive sleepers, I advise ear plugs or shutting the bedroom doors at night.
Anyway, the place is lovely. You are in good hands with Gianmarco and the apartment at Gemmellaro!
Ciao!