@Susan38
Important question!
In California, tenants rights are clear, & strict. May I suggest you do some serious research on Tenants Rights in California. Definitely determine what constitutes a tenant, and what are the responsibilities of a landlord. What is the definition of "habitability" as well. Do seek to understand the differences between "renting to tenants" and "hosting short term guests" on this platform. Nolo Press is a good place to start. Definition of terms is very important, and using inappropriate terminology can get any of us into a situation we might not ultimately relish.
I host guests in a room in my house, at maximum a week reservation. I am not looking for a housemate, and definitely wouldn't want to have to hire legal help to remove someone who had cause to say they were a tenant.
Homework time!