All of the Cat. 12 rooms (and there are only 13 of them) are under the adult nightclub area. Cabin 2509 is all the way forward, on the starboard (right) side of the ship. It's not bad as Cat. 12s go, you're not under the dance club but under the dueling pianos club instead.
I was in a catagory 12 - room 2013 I believe..... right under the nightclub, and I didn't notice any noise (other than the usual hallway noise). I wouldn't worry if I were you ..... we thought the room was just fine. As a first time cruiser (like we were) you don't know the difference anyway. ENJOY!!!
GET UP TO A $1000 SHIPBOARD CREDIT AND AN EXCLUSIVE GIFT!
If you make your Disney Cruise Line reservation with Dreams Unlimited Travel you’ll receive these incredible shipboard credits to spend on your cruise!