Renting a room in a house, Los Angeles

[Jake Dion Kindem]

I have a potential buyer interested in acquiring a listing I have. She is looking to buy the house and rent the second bedroom/office out and would like to know how much that would go for. This may be an obvious answer, but what is the best way to come up with a ballpark figure? Look at the history of room rentals in the surrounding area?

Any help would be appreciated!