I did notice, when I stayed at the W Lakeshore in Chicago that the walls were really, really thin.. There was a family of like 45 in the room next to me.. I popped down to the desk on my way out for the evening, and mentioned it.. they were going to move me, but I decided to see how the noise was when I returned.. Thankfully, quiet was to be found upon my return.. I also ensure a wonderful night of sleep with many cosmopolitans.