Short review since others taking this same ship in the fall of 2010 present some good advice.
First problem: ALWAYS ask your agent (or call Carnival) to tell you what is directly or almost directly above your cabin. Don't trust that the floor plans will reveal problems.
We selected 8210 based on other reviews, but the first night, we were up and down and up and down with rumbles and thump-thump from above. Monday morning I paced off distances and discovered that 8210 is directly under the kitchen entrance for the Mermaid Grill on the 9th (Lido Deck) level.
The Mermaid Grill is the major food service facility other than the sit-down dining room (The Normandie Room). It serves food from early (6 or 7 am) to late (10 pm) and then offers pizza all night!
The thumping and rumbling above was the food service carts, dish carts, etc., crossing the threshold from the kitchen to the walking area. The walking area is tiled, with stone tiles, while the tables areas have carpeting. But keeping the walking areas clean would be impossible with carpeted floor.
We asked for a change of rooms, but Carnival said, "have none." Tuesday, our second full day, they found us a room (5214) that was identical to 8210 but on Deck 5 rather than Deck 8. We moved ourselves in 15 minutes, and that solved the problem.
One trial learning: Never, ever, book a room without knowing specifically what is above you!
Second problem: we're Baltimore Ravens professional football fans. The BIG game that week was on Thursday, and Carnival noted on their daily Fun list (distributed to every cabin the day before) that the Ravens game would be on the TVs in the Casino and adjacent Sports Bar. We asked about room television but were told that it was only on the Casinos and Sports Bar televisions.
But the only inside smoking areas are the Casino and Sports bar! To watch the game, we were trapped in the smoky Casino and Sports bar.
We estimate that at least ¾ of the passengers on the ship didn't smoke. That is a common ratio for the USA today. Carnival forced anyone who wanted to watch the game to breathe the stinky air in the Casino or Sports bar.
Be aware of this smoking area—it's really unpleasant and we stayed away from the Casino as much as possible, but if we wanted to watch the Ravens football game, we had to stay there. Not very thoughtful of Carnival.