If you are referring to any ill-effects you might experience in your cabin I would imagine the degree of vibration,if any,depends on both deck and cabin position. If you are on a low deck at the stern of the ship,maybe there could be a problem.I was on Arcadia in June/July in a midships cabin on deck 9 and never felt or heard a thing.As for the motion of the ship in general,I didn't notice anything untoward.My wife suffers from the same degree of sea-sickness as your husband.She was ill at the beginning of our voyage but that was more to do with the sea-state than undue vibration.
Thanks for the reply, we ARE aft but on the higher decks so keep will keep our fingers crossed! Bit concerned about crossing the Bay of Biscay in November though.
Regards C Guy.
I am on the same ship and am wondering about the Bay of Biscay too.