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.
Gazelle. If you have an old cellphone or an Apple device, you can sell it here. The website will give you a cash offer for your device. If you agree, you'll be sent packaging materials. Gazelle pays the shipping costs, and you wait for a check in the mail, a gift card to be sent or cash transferred to your PayPal account. You may not make a fortune, but it's better than letting an unused device collect dust on a shelf – and far better for the environment to sell it than toss it in a landfill.
TaskRabbit. Are you willing to get your hands dirty? (Nothing shifty … we're talking, like, weeding somebody's garden.) People come to this site to find those willing to do various tasks for them, such as putting together a bookcase or running an errand for them. Do as many tasks as you want, and this could become quite the part-time (or full-time) job.
Another site worth checking out is BookScouter, which will check the selling price on 55 different vendors. The list will include the offer price, how they pay (Paypal, check, etc.) as well as whether they pay for shipping and under what terms. If you have a lot of books to sell, they can search up to 3000 ISBNs in a single request if you upgrade to BookScouter Pro. There is also historical prices too in case you want to review trends.
Robert said he did an average of 4-6 of these gigs per year for a while depending on his schedule and the work involved. The best part is, he charged a flat rate that usually worked out to around $100 per hour. And remember, this was pay he was earning to advise people on the best ways to use social media tools like Facebook and Pinterest to grow their brands.