MOLD
I just returned from DC where I stayed in a first floor room in the Wardman Tower. As soon as I entered the room, I noticed that the sprinkler was covered in moldy dust. Then the a/c vent/heating vent came into view. It was black. Black with mold. UGH. I trekked back to the registration desk, informed a nice woman of the issue who offered assurance that housekeeping would be informed. I should have insisted on a new room, but I was just exhausted after a long day of driving and the idea of packing up and moving overwhelmed me. I went out for dinner expecting to see a cleaned vent when I returned around 9 or 9:30. Nope, still black. 
Hmmm. One of the big issues with this vent is that it is located directly over the bed. Thus, it blows directly on the bed. I decided that I should clean it myself, so I stood on the bed with one of their lovely white washcloths and proceeded to turn it black. Big mistake. As I was cleaning it, large particles of mold blew all over the bed. It was obvious that there was a LOT of mold in and behind the vent. Now what to do. New room? I was so tired. It was one night. I made the bad decision to fold back the top cover of the bed and turn OFF the fan of the A/C, figuring if it wasn't blowing I would probably be okay. 
Wrong again. I woke up at 4 AM with a vile headache and facing a 10 hour drive. It wasn't worth trying to get some more sleep. I packed up, headed to check out with the black washcloth. The gentleman listened to my story, but offered me nothing. Not a word of sympathy, let alone compensation. I couldn't even beg an aspirin. (I tried). 
To make matters worse, I had parked my vehicle in the parking garage. I was told to use my room card to exit, but wasn't informed to use it in the second machine. At 5 AM in total darkness, it wasn't obvious where to use my room card. I had to leave the vehicle, walk back into the lobby, and tearfully request some help. Response? Push a "help" button on the machine. Really? I certainly would have pushed an obvious help button. 
It was a horrific experience from the moment I entered the room to the moment I finally got off the property. This is supposedly a 4 star hotel. That certainly was not my experience.