We have just returned from rhapsody. we were on deck 4 no fumes just slight vibration but not enough to keep you awake, after a couple of days you don't notice it.
Glad to say we were able to get an upgrade to deck 4, they were unable to give me the cabin no. but she said it could be deck 4 or higher & it wasn't too expensive so I'm happier about that.
We have just come off Rhapsody and we were in the bilges - no problem - very convenient for getting on and off, cabin was a bit small - but we are quite large and the staff were great, so don't worry just hae a good time!