I worked on that boat for eight years, these are my recollections: Upstairs, people do walk on the sundeck and almost all of the rooms will hear occasional footsteps. Cabin #1 is right next to the galley, so you get galley noises in the early morning. Cabin #4 shares a wall with the TV in the salon, so sometimes if folks are watching movies late at night the sound can be heard through the wall. Cabins # 3 & 7 are all the way forward and are great for couples, although cabin #3 is on the port side where the mooring line is attached--sometimes you hear the creaking of the line on the rollers.
Downstairs: Avoid cabins 8 & 12 as they are closest to the generator spaces. The heat from the engineering spaces exacerbates condensation issues. Avoid cabin # 11 because it is the smallest on the boat. I recommend Cabins 10, 14, 15. Lower center is the most stable. You might have minor condensation issues, but these are the best cabins on the boat.