We had a wonderful time in Romina'a apartment. Is a very cosy and the roof terrace is just amazing. It was clean and Romina was a very kind host. She gave us tipps of what to eat and what do and how we can get to different places and she even had some groceries for us.
The neighborhood is quiet and we always felt safe. There is a mini supermarket close to the house, but there is also a bigger one in Via Verona (3 min walk). Also in Via Verona, there is a very nice little Café, where you have Granita e briosce, traditional breakfast in Catania :) The stuff is there is really nice and the prices are more than fair. There's also another Café in V. F. Riso, a bit further down after the supermarket, which is very nice.
The Piazza Trento is super near and there are buses frequently running to the airport or Central Station or Piazza Falcoe e Borsellino, from where you can take a bus to the beach or a bus to Taormina, Siracusa or other cities. There are also lots of buses going back, however be aware that they don't stop at Piazza Trento on the way back, but at Piazza Vittoria Emanuele/Via Umberto, which is 5 min away from the apartment.
Via Etnea is only 5 min away by walking and the dome/centre 10-15 min. If you are fine with a smaller market than the big fish market, you can go to Piazza Carlo Alberto, which is closer to the apartment.
All in all, Catania is a busy place, but it's located very central and Romina's apartment is the perfect place to spend your vacation in Catania, because it is central, but also quiet. We really enjoyed our time there and were sad, when we had to go back :)