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The upper birth is a single bed that folds down out of the ceiling at night and is stored back in the ceiling during the day.
My daughter used it on our trip a few months bac - Solstice also - and had no problems with it. There is a rail to make sure you do not fall out and a ladder to get in and out of with very easily.
I think the kids will fight for that than the other birth.
There is a bed - as I am told that is part of the couch.
But the room steward said the top bunk was better - more comfortable han the couch bed.
No matter which way you go it should not be a problem for them.