I actually tried to google the location of the engines on the Fantasy and couldn't find any specific info. I'm not an expert googler though. I know the funnel shaft should be somewhere between port cabin R190 and starboard cabin R185.
I think the loudest ship noise I ever heard was in a porthole cabin on a Fantasy class ship when they dropped the anchor. I was wide awake after that. No complaints about it, we were at Grand Cayman and I wanted to get an early start anyway.