If you follow @CambridgeAccomm on Twitter you will see a tweet whenever a new advertisement is posted.
I suggest that you do not part with any money until you have visited the property and you have a proper isgned contract in your hands. This won't guarantee against fraud, but it will avoid some of the scammers.
If this happens to you please tell the police, and let me have the details of the advertisements so that I can delete them.
Another scam currently doing the rounds is to email you asking you to call back on a premium rate (eg 070) number - you get to pay to listen to a recorded message containing lots of waffle, and there's no real room or tenant on offer of course.