If i may add two cents, personal escrow transactions may be really risky as for now you have to datamine a lots of info about that person, then be fully assured that this is exactly him/her, because you never know is there some kind of identity thieft or not. Overall too much care for simple operation that ready to be automated by services rising up each and every day here and there. In fact, sorry that i talking not about exactly your case, but Etherium was developed to build an automated escrow services as well. So i am pretty sure that they are already exist, only question of first positive feedback about at least one that someone will search out:-).