I worked on the Romantica for a while last year.
The ship is nice in some ways, not being so "Carnivalesque" and the newer Costa ships are like the Magica and the Fortuna, but the stabilizers are not good, swings a lot.
I did a transatlantic cross with it from Savona to Brazil and around Madeira we had a storm, it really swung a lot.
And it was not that strong a storm.
Also, like any Costa ship, expect poor service and disgusting food, like Carnival.
But as far as the decor it´s actually quite in good taste.
And also its a small ship, which I like much better.
