I always meet with the CraigList people on the parking lot of the local police station. Always. Most people have absolutely no problem with it. Legitimate people, anyway.
After I'd mentioned this usual meeting place, the source with 3 snakes just disappeared. Vanished. No answers to my text/emails.
WTF is that...
A clear red flag is what it is... If you still get a meetup or something arranged with them, especially if at a different location, bring along a friend or someone ― better safe than sorry!