Actually no. There are more cabins than people. Ember Star gave me a deck plan that had 5 passenger cabins, so I changed the ship specs to reflect that. So now there are 2 double crew cabins (dibs to you and the first mate if you want those), 3 single crew cabins, 5 passenger cabins (2 double, 3 single) and 2 shuttles (at least one of which I'd recommend leaving empty).