The best article I have read on this subject is from the No Nonsense Landlord blog: http://www.nononsenselandlord.com/2014/05/four-pillars-tenant-screening/I know you asked for a service, but in the DIY mustachian spirit, there is definitely money to be saved by doing some research yourself.The author of that blog is also on the forum and seems to be very knowledgeable about landlord related matters.