I do not mind you making this public as there is clearly a problem with the way AirBnB has handled your grievance regarding your desire to receive a discount for the extra night stay.
I hope you know, I made every attempt to make sure you and your husband were comfortable from the very start, including purchasing a new fan for the bedroom when the temperature went up slightly for a couple days. I came by and checked on you and your comfort with the property, taking care of the garden and grounds throughout your stay. At any given time you could have shared your concerns about the cleanliness of the property, but unfortunately, you did not.
From my honest perspective as the host, it seems rather disingenuous after all this time to now state the cottage was not clean or that the lodging experience did not meet your expectations. This is especially alarming after receiving your communications upon your departure telling me how much you enjoyed your stay. I have had numerous guests stay at the cottage, including professional travel writers, and no one has ever complained about smells or cleanliness. The one minor issue with the clothes washer you raised during your stay was immediately responded to, and according to your written acknowledgment, mutually resolved. So I am saddened by your disparaging review, but I believe your real concerns are with AirBnB because you now feel they somehow failed to meet your expectations during the booking process.
As this booking was managed through AirBnB, they are 100% responsible for notifying you of the rates and fees at the time of booking. If they charged you more for your booking than what was published at the time of your request, they have also charged me more in fees.
It is my experience AirBnB presents travelers with options prior to booking to confirm or decline based on your willingness to pay additional rates and fees for specified dates. AirBnB is responsible for making sure you view and confirm the difference between Off Season Rates and High Season Rates. If this is not the case, I fully expect AirBnB to take the necessary actions to make this right for both of us.