My diagram of the ship shows that cabin as one with two twin beds that can convert into a king, plus a single convertible sofa. That is the same type cabin I will have in September on the Conquest. Check out these photos posted by a previous cruiser...
That cabin is mid-level so it's not so high that you'd feel the movement too much; its also between midship and aft where midship is where you feel movement the least. I think you will enjoy the location of that cabin. Only negative I see is that you are about half way between the mid and aft elevators so you'll have a bit of a walk each time you go to the elevator. Of course in my opinion there is nothing negative about a cruise vacation. HAPPY CRUISING!!
Life's a Beach ... enjoy it on a Cruise!