Information provided on Forbes Advisor is for educational purposes only. Your financial situation is unique and the products and services we review may not be right for your circumstances.

Information provided on Forbes Advisor is for educational purposes only. Your financial situation is unique and the products and services we review may not be right for your circumstances.

While struggling to pay their bills in 2007, two San Francisco residents began renting their spare room out to conference-goers when all the hotels in the city were full. Less than two decades ...