Just like Craigslist or Facebook discussion pages, if you have a place you're trying to rent, or you're looking for a place, create a Forum and make an "advertisement" for it. People can either respond on the Forum or contact you with the contact info you've given them.
For example: "Looking for a female roommate for a 3 bedroom house in Westminster. $350 rent including utilities. Have your own bedroom. Check out photos under my profile. Call me at 720-987-8998 for more info!"
OR, if you are looking for a place to live, let people know about your criteria (don't be too picky though!):
"Male looking for roommate(s) near or around southeast Denver, where I work. I can afford up to $500/mo. Email me on this site or call me at 720-987-8998!"
Make sure you leave your contact info for when someone wants to contact you directly. They can also send you a message on this site, or just respond on the Forum.
Jonathan Ghaly
thedenverhouseguy.com