Had a week on the Costa Serena our first Cruise with Costa, although we have cruised many times before.
The ship is beautiful and the facilities are good. Food very good and a wide choice.
The destinations on this cruise where excellent and shore excursions well planed.
We had an inside cabin deck one my partner gets motion sickness and the movement of the ship in negligible low down and she can't look at the sea going up and down in the port hole. Cabin door slamming is a nation sport with the Italian guests. The cabin was big enough for 2 people and the facilities very good although the television was an old CRT and on it's last legs.