you mean kind of like a rating system for the travelers? they could have their own profile or something, with ratings and comments by hosts...
...and the same for the host. Both parties should have the same tools.
Of course I hope - and believe - that all the ratings will be 4 or 5 stars and that the utility of these tools will seem futile, but it's better to have it for nothing than not have it when needed.
Oh, question to those who are working on it: do you need a independant site for this project? or couldn't you simply put another "Title" with the "NEWS, FORUM, ARTIC...