Arcadia was our first cruise ship when we began cruising, and we loved her. The standard balcony cabins are lovely with a separate sitting area, like the deluxe balconies on other ships.
She has a wonderful two-tier theatre with comfortable, large seats.
There is no atrium, which some see as a problem. Two of Arcadia's lifts, one port and one starboard, are glass fronted facing out towards the sea. Gave me quite a start I can tell you when the lift doors opened.
As on Aurora, (our favourite ship), there aren't as many dining options or watering holes as the larger ships, but it depends on what you want from your cruise.
We've been on Arcadia 4 times and have enjoyed every one. We have been on all P&O's smaller ships and liked every one, but it's just my personal opinion.
Avril