Dealing with roommates is no doubt a venerable problem to solve, but is there really a 'market' here that people will pay to address? There are so many lucrative and important issues out there, solving roommate management seems way down the list in terms of building a viable business. I base that last bit on the fact the OP describes this as a "startup" not a project.
I would emplor the OP to get out into the world more and find better problems to solve.
* = I use the term "debbie downer" after the recent HN post about searching for the weird terms people use in their comments. Debbie Downer was one of them.