We were on Arvia Oct. 23 for the TA to the Carribbean. We expected that the ship would be busy due to the many sea days but all I can say is thank heavens we were in a balcony cabin so we could escape the crowds.
On the whole we did enjoy the ship but we had to be organised to ensure we didn't miss out on things like dining choice and entertainment etc.
On our cruise the sunbed issue was a problem, people started putting towels out from 06:00 with most being taken by 09:00 unfortunately they weren't occupied until much later.
The experience didn't put us off sailing with p&o again but we wouldn't book another TA.