How much should I charge a renter, renting 1 room in Redondo Beach?

They get cable T.V., internet access, their own bathroom, access to our washing machine, fridge and kitchen. Oh, and she has a kid who is going to share the room with her. (kind of a hassle). The location is also near the beach. Please help, I need to know how much to charge per month.

your mortgage plus 15-25%, depending on comps and condition.