Just from following this chat website...I'm under the impression no one really recommends the rooms from the 3rd floor down. Many have said they smell. My father said his did not smell, however, when pulling into ports the sounds of the engines/thrusters are really loud.
He stayed way in the front on the 9th deck once and said it swayed a little. We've stayed in the rear on the 8th floor no problems.
Good luck- I'm not exactly sure where your room is located on the 9th floor but you can look it up online, if you haven't already.