I just had the behind the scenes tour on the Jewel. Deck 2 is primarily crew working areas, including provision stores, the Engine Control. room, the Medical facility, and other offices. I'm on Deck 3 just forward of the forward elevators, and we haven't had any problem with noise at all. Even the bow thruster isn't too bad. There's a little noise, but no vibration. (It does not wake my wife up.)
Aloha,
John