References. References. References. Ask for at least three.
As far as the risk of the person being some sort of psychopath, if someone is bent on ill deeds, they generally don’t advertise their services on Craigslist.
I’ve rented apartments to people I’ve found on CL, sold items on Craigslist, bought items on Craigslist, advertised my services on Craigslist, contracted services on Craigslist. And I’m still not dead. The worst that happened was that a few people wasted my time. Maybe East Coast people are less paranoid about crime, but that’s the way it goes.