We booked an Inside Quad Guarantee about 9 months in advance(?a 4A)and were absolutely thrilled to be upgraded to 6E(highest level OceanView with floor-ceiling window). It was on the Spa Deck cabin 1104 near the front of the ship (which some people may feel more movement than midship/lower deck).
Thank-you Magical Upgrade Fairy!!! We(2 adults, 2 kids) loved our room!!!! How will we ever survive a plain old Inside now??!!