Thank you for your stay and feedback. I was disappointed to hear of your poor sleep, and the findings of a dirty air filter. I can assure you I personally check 10% of the arrivals daily not only for cleanliness, and a peek at the filters, under the beds, etc.... but to also leave a welcome note and goody for our top Hilton Honor's travelers. I can further assure you my team consistently exceeds the Brand goals for rooms preventive maintenance, which includes changing the filters. Bottomline, no excuses, and I welcome your call or email to discuss further, and by now you should also have an email from me to further investigate. We as a hotel and brand have a promise, and if you are not happy we want to know and we want to address your concerns to make you happy, and return. Count on me to fix this, John Cario General Manager