I'm not sure what ship ylimecruiser was on with the noisy experience with the adjoining cabin door. We have cruised on several ships with RCI that had adjoining doors. Not once did it pose a noise problem. First of all, there are two doors with an air space in between them, so they pose no more noise than a conventional wall.
The bigger issue is that on some ships, the cabin with adjoining door may eliminate a sofa. This happened to us on Freedom of the Seas. It was a design flaw in my opinion as there was plenty of room for a shorter sofa or at least a padded chair. But you shouldn't have any problem with noise, so I would book it.
Take care, Steve
I'm Steve Cooper. I love Royal Caribbean, and recently discovered NCL and love them too. I've also cruised Princess and HAL.
NCL Pearl Alaska Glacier Bay
RCI Liberty of the Seas E. Caribbean