For millennials who have moved back home and are looking for careers or are working part-time, paid online surveys are a great tool for making money from home. A few weeks of responding to questionnaires can earn a considerable sum of Opinion Outpost points. That should be good enough to bring in a few extra dollars, but savvy survey respondents will wait even longer and use their earnings to help with their budget or other expenses. Referring a friend to Opinion Outpost is a great way to make even more bonus cash, and it's just as easy as taking surveys.
note: things are a little different since I wrote it, as the platform changed from a proprietary, site-locked currency to their own cryptocurrency, which can be taken and sold off-site, so for anyone who wants to mess with that, it might be worth considering listing some things for the currency as you might make more that way than you would inflating the shipping cost.
Research other listings in your city on AirBnB and see what the going rate is for a place like yours. You could also just rent out a private room as well or even a bed in a shared room. In fact, that's how AirBnB got its start. However, you might find it hard in the beginning without reviews, but as long as you take really good care of your guests and provide a lot of value, the reviews will eventually come rolling in.