Hotel Horror Stories: Employees Edition
A Smell Not of This Earth
A couple came to a hotel for a week, and requested the staff simply place the linens and towels by the door, that they would do the cleanup themselves. After a week, a maid went in to check on the room, and immediately vomited after stepping into the room.

A Smell Not of This Earth
There was feces smeared and covering practically every inch of the room, even the air conditioning system. They had to evacuate the entire hotel and call hazmat to clean it up.