My previous cruise was a transatlantic crossing on Queen Mary 2. Friends warned me that a P&O cruise would be different and so I booked and embarked on the cruise with that in mind. This was a last minute booking about 10 days prior to embarkation. There were great deals going that I couldn't pass up and I ended up getting a 14 day cruise to New Zealand for an excellent price (solo passenger). Pleasingly I was upgraded prior to embarkation day from category G to F (still a porthole cabin).
The embarkation process at the Brisbane passenger terminal was relaxed and stress free; I didn't have to wait that long before I boarded the ship. My initial opinion was a positive one and I particularly like the three story atrium with 'grand' staircase. I found my cabin with ease and was quite pleased with the size of the room. It was clean with plenty of cupboard space (but strangely nowhere to put the suitcase - which I ended up keeping by the bed) and a relatively spacious bathroom and shower. Bear in mind that I formed this opinion as a solo traveller - I suspect that four people in the same room may not think it so roomy.
The steward's name was Stackla and he did a good job throughout the cruise of keeping my room clean. A couple of days I didn't get towels for some strange reason, but overall I thought he did a good job. Stackla was friendly and polite and always made an effort to smile and say hello.