I would also recommend a trusted MM with this guy. I added him on Skype and then I remember we've done a trade before, he just accused me of not paying him but and then threatening to call my local authorities (lol?) and shits for him, I have a screenshot of the money I sent him in paypal along with all of his information.
If your going to trade this guy, used an MM, we traded once and it went smoothly, not so much now.