> and get more people to review honestly

This. Something I hate is when people think that 5 stars have to be given "by default". For me, an uneventful stay in a clean place should mean 3 stars. If the place is specially nice or the owner was really kind, 4 stars. And 5 stars should only be for my _favourite_ places.

I stopped doing airbnb when, for several times, I booked 4.5 star places and they turned out to be honestly crappy.