I love aft facing cabins. The only negative is if you are on the deck immediately below the lido deck pool it can be noisey, or in the unlikely event you hit rough seas you'll feel the motion more at the stern.
Just to be sure to check out the deck plans and see how far the stairs and elevators are from the back. One draw back of the RCCL "Radiance" class ships, you have to walk all the way midship before you can go up or down, unless you use the service stairs, but thats frowned apon, I know, tried that and got caught. Other ships, that has not been a problem, so hopefully for you it won't. WE also love the cabins/balconies back there, have never had any problems with exhaust or excess noise from above. We did have some very unconsiderate next door neighbors on one cruise, but that can happen anywhere on the ship.
I, too, love aft cabins. Donna is correct about all the walking you have to do to get to the steps or elevator, but I consider it exercise (and then allow myself even more desserts, ).
Mary Lou Scanlon
NCL Pride of America April 24, 2010
NCL Epic February 12, 2011
RCCL Allure of the Seas - September 18, 2011
Celebrity Eclipse - February 11, 2012:
RCCL Navigator OTS - February 9, 2013
My husband and I had an aft on The Conquest last year. The view was wonderful and we smelled nothing except salt air. We did have a problem with trash either being thrown off or blown off decks above us. I had cigarette butts and ashes fall on me and most mornings we had a few cups, bottles, and other gargage on the balcony. We were on the Empress deck and our balcony stuck out further than the decks above. Our friends were next door and luckily had nothing like this happen.