I don't think 'the size can vary...The beds are 3 foot singles. When pushed together they are called QUEEN SIZE.
I don't think a child or adult as a 3rd person is allowed in a cabin for 2 people...?
P&O Arcadia -Canaries, Aurora- Bruges, Arcadia -Med, Aurora Amsterdam, -Arcadia -Venice, and Ventura Bruges. In 2009 - Oriana and Oceana Fjords.