We just took a cruise a few weeks ago in an inside cabin with adjoining door. In the middle of the night, every time the guy in the next cabin sneezed it sounded like he was right in our cabin and scared me out of my sleep. Our bed was right up against the door and we could hear the couple in there talking and their TV but that was about it since we were really in there just at night anyway. I would prefer not to ever have a connecting door again, but I can sacrifice it for a week. However, if you happen to be stuck next to a family with noisy kids or someone that snores all night, or people that stay up and watch movies, then that would be really bad. Since you don't know how bad it could be, tell your travel agent not to book the adjoining door.