I travel a lot for work, use airbnb pretty often, rarely complain. I was looking forward to having an apartment to stay in after being on the road for work. But I had to vacate the unit after a few hours due to the intensity of the odor of something like mothballs. It was really intense. It gave me a terrible headache and congestion. I don't have allergies and generally very healthy, so was surprised how quickly I was impacted. It wasn't tolerable at all and made all my clothes also smell. I slept downstairs in the building's social spaces for a few hours until the morning when I could walk over to a nearby hotel and check-in. This was preceded by a suspicious request to email - outside of airbnb's system - a photo of my ID to run a background check.