We booked a mini-suite (M206) and had no problems with noise from the upper deck. None at all. It also kept us close to the 16th deck where the Horizon restaurant was located and to the 17th deck where we preferred to lounge.
I peaked in to an interior room and just couldn't imagine having to stay in one. I mean, if your budget doesn't allow a balcony stateroom I can understand. It was small and cramped in my humble opinion. A balcony stateroom is the lowest I could go. The price of our mini suite was $1500/person and the price dropped to $1100/person about a month before the start of the cruise. We were offered an upgrade to an owners suite for $800 but didn't do it.
This was our third cruise. The food on this cruise was outstanding.
Was a very nice cabin. The AC worked well, the TV's (2) were loaded with great stuff, the shower pressure and temperature were awesome and the attendant did a good job. Never saw her.