I'm pretty sure CS has an element where you can be verified by making a small donation (with a valid cc). Plus, references seem to go a long way and personally,

I'm pretty sure CS has an element where you can be verified by making a small donation (with a valid cc). Plus, references seem to go a long way and personally, I advise looking for CS stays while at meetings in the city you want to stay in. Book a night or two in a hostel then go to the meetings and ask around. It's a good way to get a feel for who'd be a good fit.