The room they put me in initially smelled like I was breathing through a dirty wet gym sock. I wasn't expecting much, and I just needed a place to crash, so I put up with it and spent the night. I woke up with a nasty cough... As I tried to get ready, I made a horrifying discovery - the paint above the shower was sagging away from the wall exposing black mold underneath.
To their credit, as soon as I made the hotel aware they found me a new room. However the smell and visible mold tells me that they've been ignoring the issue for a while. The new room was completely fine, so presumably the issue is limited to that one room, but that room would be very dangerous for anyone with mold sensitivity.