You can find the stateroom reports here http://www.wdwinfo.com/wdwinfo/cruise-new/roomlist.cfm. The Magic & Wonder are practically identical as far as the staterooms go so a report from one would apply to the other. You can also check out the rooms around yours for possible problems.
I had that the room on my very first cruise, and would stay in it again.
When the ship was an rocking on the upper decks, I felt nothing in the room.
Have fun.
John
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