I have never stayed in this cabin before, but I have some info for you.
Stateroom 6150 is all the way aft (the back of the ship). It's so far back that there are only two staterooms left(behind yours on your side) untill you get to the very back of the ship.
I personally enjoy cruising more in the midship/aft areas because you don't feel it as much. Also, all of the main restauruants with the exception of Lumiere's, is at the back of the ship. The Buffet (Topsiders) is on Floor Nine aft.
I know a whole lot more about both of the ships (having cruised on them over 25 times). If there is anything else that you would like to know about anything realated to either ship, please let me know.