Depending on your location, there may be institutions similar to Dogpatch Labs or Hacker Dojo. These are places where hackers can get cheap temporary 1-2 person spaces to work. I don't know of any outside of the bay area though.

I think a 'find other hackers site' is a great idea. Given that you are a hacker yourself, why don't you make a site like this? If it was well made, I would use it.