Oh please, a site for other prospective entrepreneurs on budget of $0 vs a site aimed at a fixing a very real problem in the vast and lucrative world of property?
Inspiration through need is organic and genuine - he needed something, he built it, and other people want it. That's been the essence of startup culture from the beginning.
You understood the cofounder project because of your background. But for the vast majority of people, residen.se would be easier to understand.
And besides, how easy it was to understand from the site is something that can easily be changed with a few hours of work. What you really want to know is the viability of the underlying business model. And I find it difficult to see very many situations in which serving entrepreneurs tight on cash is better than trying to take a cut of the (very large) real estate pie.
Everyone in the world needs a place to live, whereas probably less than 0.001% of people need a cofounder.