We were actually in a DA cabin which is a little smaller than yours. We had ONE teenager with us and we had plenty of room. Her bed pulled down from the ceiling and was directly above our heads (we were on a double below).
The balcony made a HUGE difference, because when she wanted to get dressed we would go out and sit awhile and watch the ocean.
There was plenty of room for empty cases under our bed.
Have a wonderful time, the balcony is fantastic -- I wish we could go again.