This project has big potential to be a very effective tool in neighbourhoods, but I'm guessing you guys are all techies and not quite sure how to market this.

Depending on how many of you built this, start populating it by renting your own stuff and making your area the default location.

As a casual user, I want to see at least some activity on the site.

Also, your landing page is not incentivizing (is that not a word?) renters enough (or boldly enough).

Create price-points and stuff and draw folks in with money.

Now here comes the interesting part. This might be the first promotion you are doing. It may pick up on HN (or not) and you may feel shit if it doesn't and think about abandoning it, but you shouldn't.

Lastly, I'd suggest you try enhancing the "social" side of things a bit more through something like facebooks graph DB (or "friends of friends").

I won't rent shit to any guy who pings me on your app, but if Tom is a friend of my friend Jerry, I'll have incentive to trust him because Jerry knows him.

Good luck and keep promoting.