I booked my first P&O cruise last August through the website with $1 deposit. A few months later I decided to tack on the 4 days up to Exmouth. I then rang them sometime before Xmas and asked if I could stay in the same cabin for both legs. The lady I spoke to assigned me the same BA balcony for both legs on the spot and I still have it even though I don't pay in full till Nov. It is a balcony set up for 2 people. However, I'm not fussed where I go, so booking the midship option is fine as I know I won't end up crap BF cabins or whatever they are called on P&O in a noisy or irritating location. I'm sure there will be plenty of laughter in the corridors 😄