It seems some guests never leave responses, and I am concerned they may be trying to 'play the system'. Given it needs both Host and Guest to provide feedback before it is published, and thus ratings are assembled, seeing Guests who have been members for many years with 0 Reviews makes me suspicious. The Guests we have had theat have not left responses and been in this category or have very few Reviews given their activity have indeed been the ones you would prefer not to come back. Is there any way to share, apart from "Report the User" (which I am not sure what that gives to future hosts), that would enable future Hosts to beware, especially when you are an Instant Book Host.