Leo's place is in a great spot near the Alibus 'Archi' stop, and not far from the train station. While the area may look grimy, it's perfectly safe and only 2 minutes from the centre with amazing architecture on your doorstep and lovely eateries galore if you don't fancy using the nice kitchen in the apartment.
The room is incredible as it's part of what looks like an old palace and it's great having the balcony for an early evening aperitif overlooking the nearby piazza.
Despite it's central location, the street noise is unobtrusive and the bed is super comfortable so for a solo traveller or couple, it's an excellent choice.
I wasn't disturbed by the other guests but I imagine if there was a noisy person next door, it may have been quite loud in the room but I'm sure Leo would be a good mediator if so.
Leo couldn't have been more helpful and friendly, sharing a coffee with me on arrival and sorting out a mobile internet box.
The perfect base in Catania for exploring a fantastic city and day trips to the coast (I'd highly recommend the 2 euro return 534 bus to Aci Castello, with a walk to Aci Trezza / train to Siracusa and a day in Ortigia!).
What else can I say? Stay with Leo at his great apartment!