I'm looking at the floorplans in my owner's manual and it shows a Luxury Suite as being 640 sq. ft. of room with 75 sq. ft. of terrace. It has a separate bedroom with two beds, one bathroom, a kitchenette, and living room with a sofa bed that would sleep two. That's how they would get that it sleeps 6.
There is a Master Suite--a one bedroom with two bathrooms and it is 747 sq. ft. of room and 64 sq. ft. of terrace. It also has two beds in the bedroom and a sofa bed.
There is another Master Suite with the same room set up as above but with two terraces. It shows 781 sq. ft. of room and 129 sq. ft.
I don't know exactly which one you'd get upon check-in but it wouldn't hurt to ask for the larger unit with two bathrooms instead of one if it's available.