Not even my opinion, well known fact, least amount of motion is felt midship, lowest decks. The higher up you go, the more motion is felt. The most motion is felt forward, top decks. Though, if you get a rough night at sea, you'll feel it everywhere. AND unless you spend the majority of your time in the cabin, you'll be up, forward and aft. for shows, pools, dinner, etc. But for nighttime sleeping, midship, lowest decks.
Mrsfuzzmo