Interesting question, and I could hypothesize all day about issues you'd have to work out: -> liability if stuff gets stolen? -> 24/7 access? (if you're renting storage space in the basement, do you have to give renters keys to your house?) -> Look at pricing for storage places and then ask yourself what pricing makes sense for both parties. Like if $70/month gets you a 10x12 storage space at a professional site how cheap would a c2c alternative have to be? Maybe $40/month? Would $40/month be worth the hassle of storing someone else's stuff in your garage?

Best approach is probably just send an email to the storably people to get the straight dope. Looks like their team is still intact.