I am new to HAL and am looking at booking an AFT Neptune Suite on Rotterdam on a Norway cruise and wanted to know how much vibration - noise - motion there is on this class ship. I have sailed many aft cabins on Celebrity, RCCL & Azamara and I’m OK with some motion but vibration would really bother me. The only cabin open now is on deck 5. Any other tips about these cabins would be welcome.