Question #1--Yes I have stayed next to the elevators.
Question #2--It was only noisy if your a lite sleeper. I only heard the doors opening now and then if I was up. My wife said she did not like it.
Question #3--I have stayed in rooms close to the rear of the ship but never in the very back. I like to stay from mid-ship to near the front. I also like staying lido deck or higher if possible. The higher I go the less my wife feels the movement. You do feel the movement while in bed but it reminds me of the waterbed years. My wife said it rocks her to sleep .
I hope this helps you some.