Opera was perfect for our family (2 adults&2kids) three night stay in Thessoloniki. It's only a 4€ taxi ride into the centre and a 10min walk to waterfront. Is handy for local shops, overlooks a little park, and a great restaurant Elia Lemoni. Cristina gave us a very friendly greeting, showed us around the first floor flat and shared useful local info. We stayed mid August, it was hot 35° - there is only one a/c unit in the lounge, but it cools the apartment fine with all the doors open. The city flats are small, but layout made it feel spacious enough, and it has a balcony around it. It was in a nice authentic zone, and very quiet at night, we slept well. Everything was clean and well presented, well equipped, lovely linens and towels, with spares if required. We would definately recommend it.