The next few ideas and posts will feel like to you that I had an idea that popped out of my head according to the stage of life I was in. These one are back when I was at school or a bit after I graduated.
A site to aggregate apartment hunting in (your city)
Back when I was a student I was in a COOP program where you’re four months in school then four months in an internship. Because of that, I had to apartment hunt every four months and since it’s only four months it was hard to find a good apartment since most leases required a full year. That leaves us usually three options, one you rent a full year and you find students that are in your program, but don’t have the same four months in school as you do. The second option is to find a place that rents by the month, but it’s usually more expensive. The third option was to find someone who had a room to rent. Finding an apartment was not that hard since they were in the classified ads. However, finding a room was because classified ads were too expensive for students; they usually relied on their university board. Sometimes you could find some online, but this was before the days of Craigslist and facebook marketplace (damn that made me feel old).
Nowadays finding a room to rent is easier, there is craigslist, airbnb, roomies.ca and dozens of sites that provide this kind of service.
It could just be ads on the site like craiglist or the option to put your listing at the top of the page like kijiji or facebook market place.