We were in 7020 - exact cabin but on the other side of the ship. You will LOVE this spot! Very quiet and close to the stairs. It is not an adjoining room and that is also terrific. Bottom line, I think if you are bothered by motion, you will be most anywhere on the boat - amount of motion vary SO little compared to the fact that there IS motion - do you know what I mean? It's like when it is very hot - a few degrees either way is hardly helpful. My suggestion is to read lots of tips to deal with motion sickness, prepare some things to deal - and then plan on a great time!
Bottom line, this is a great spot!
One tip I can share - when the ship is docked and you are returning onto the ship - pay close attention to whether the forward gangway is open ...the aft gangway was often jammed (since it was often closer to the port) and when I looked - the forward was open with no line - better yet - it was closer to the room whether stairs or elevator.
Enjoy!
Barbara