Cat 3 layout on the Century. Since all of the category 3's on the Penthouse deck are now concierge class rooms you must be talking about the Family cabins on the AFT of the ship.
They are 210 sq ft. (As compared to 171-172 sq ft of the rest of the rooms, non-suite).
There is a Full Bed with a separation between a sitting room that has a sliding glass door between the bedroom. In the sitting room there are two beds in a L shape that are made to be couches during the day, there is also a drop down upper bunk above one of the couches. There is a recessed Bay window. (The recessed portion is great for storing items or even letting a small child sit/sleep back there.