Agree with previous reviewer that bedandbreakfast.com reviews are of questionable reliability. I would not use this site alone but check other travel sites first to make sure things jive. There have been reports on Trip Advisor of properties with glowing reviews on bedandbreakfast.com but not so positive reviews elsewhere, and of course it was the latter that turned out more accurate.
As mentioned by the other reviewer, they don't seem screen positive reviews... a look at a couple of random properties shows several one- or two-liner 4 and 5 star reviews but no reviews with under 4 stars. Hmm... On the other hand, if you rate anything under 3 stars on any aspect, you get an e-mail, "Please supply us proof of stay in the form of your accommodation receipt or documentation of your payment to the property". The fact of the matter is, most people when confronted by the extra requirement -- and potential invasion of privacy that this represents -- would probably back out.
I don't know that I believe that false positive reviews don't happen... see Yelp and their decision to apply filters that apply to both positive AND negative reviews. It does seem suspicious that bedandbreakfast.com filters only negative reviews. Then again, since bedandbreakfast.com has a certain financial stake in selling gift certificates that can be applied to some properties listed on their site, it DOES make sense they would promote positive reviews and discourage negative reviews, though. Again, hmm...