"All reviews are published, whether both parties leave one or not, after 14 days, or sooner if both parties submit one. A review will only be removed if it violates Airbnb's review policy (which isn't that it's a bad review- rather if it is discriminatory, profane, mentions Airbnb involvement in a dispute)"
I'm sure this is the official policy, but it is not the experience of myself or others in this discussion. Of the ten or so reviews I have written the only one that doesn't appear is the bad one. The host has submitted a review and it was many weeks ago. There was nothing profane or discriminatory. AirBnB is not involved in any dispute. Yet it is the only one that doesn't appear.
I think it would benefit AirBnB to offer an explanation to the guest when it is decided to hide a review. Apart from undermining our confidence in property descriptions, it is exactly the sort of thing that triggers scandalous press coverage.