I rented an apartment in a metropolitan city via airbnb last year. Both the owner and the apartment got about ~15 excellent reviews. It turned out the owner was very indeed very nice and friendly, but the apartment was far from both the description and the reviews. Our friends living in the city was astound since the price we paid should get us a much better deal than that.
It made me wonder if 1) the reviews were "regulated" or "engineered" somehow, 2) due to the two-way review system, renters were reluctant to write a bad review since they were concerned they could get retaliated by the owners giving them bad reviews in response.
Edit: fix typos