Airbnb know the reason when a guest give a bad review. But the guests are more important to Airbnb than the host because the large money for Airbnb comes from the guest, so all the rights are for the guest. This are all the reasons for a bad review from the guest
no refund for early cancelation
asking the guest to respect the house rules
the guest burns the new carpet in the room - 1 star
all this is reported to Airbnb, but like you say Airbnb don,t care about the hosts.
I have 8 rooms, and it is my home and we are consistend with our house keeping
the guests are not consistend and we have to put up with very bad practices on part
of the guests. Basic commen sense tells you, there can not be 200 reviews with the
house clean and 30 reviews with the house dirty.
My contract state once a week house keeping, but I have my staff go twice a week
to make sure the kitchen and bathrooms are clean and a guest with a private bathroom
complains that her bathroom is not clean and the host pay the price in the review.
I reached the point to give up because other host don,t wish to fight the matter.