Kim, I've had one cruise on the Navigator and LOVED her! Yes there is vibration and clanging etc but you are on a SHIP and that is part of being on the ocean. It's fun. I think the Navigator is the perfect size for a ship.
The standard cabin on the Navigator is a lovely thing indeed. We were in 919 and had storage space to spare. The bathroom is really a marvel, too, with the separate shower and tub.