We had our silver wedding anniversary this year on the Coral Princess and we had a mini suite with a balcony and it was lovely. If you give them notice that it is a special occasion you get balloons a bottle of champagne and some chocolate dipped strawberries and some red roses, it was a joint celebration for me as it was also my birthday. You will have a fantastic time enjoy.
We had a balcony cabin on OV1. They are lovely (the rooms are actually the same size as most of the other cabins but you get the balcony as extra space) and it's great to sit or recline on your balcony when/if it's in the sun. It's also nice to be able to see where you are just by lying in or on the bed.