Of course! Here's a simpler and still polite version:
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First of all, on behalf of the resort, I would like to sincerely apologize for the bad experience you had during your stay. We are truly sorry that the cleanliness of the room did not meet your expectations. Your feedback is very important to us, and we will take the necessary steps to improve in this area.
For your information, our resort is currently available for booking only through Agoda, Traveloka, Ticket.com or by calling us directly. We are not listed on Booking.com at the moment.
Once again, we truly apologize for the inconvenience and thank you for your valuable feedback.