Look at it this way: if you keep rents low, you are essentially subsidizing this individual so they can rent a place they otherwise wouldn't be able to afford.Give the renter the appropriate notice of termination.

Find a property that needs a little TLC and is discounted appropriately.

Any investor, or anyone who knows anything about ADUs, will see the value, and will recognize an appropriate price.

days, which will include far more turnover and court time than anybody wants.One final point, as a general comment, not reflecting on OP, but there are a lot of Owners that are unable or unwilling to make appropriate repairs or properly prepare a vacant unit.

I heard in the county there is something called a "rental permit" which some investors get even without the appropriate zoning.

The appropriate way to project cash flows would be to provide a range within a 95%-or-so confidence interval* I'm not sure what you mean by "averages don't mean much". 

We had a toilet at our rental overflow (not exactly sure why yet) but it's caused around 6k worth of damage.The disaster clean up company we're using has a de-humidifier that is making the rental over 90 degrees inside.What kind of compensation would be appropriate for the tenant? 

Do these numbers make sense or seem appropriate?

I'll give you $1,000.00 (or whatever amount is feasible and appropriate) to be out by the end of the month (or whatever date is feasible and appropriate).

You would want to calculate an appropriate amount of appreciation, and then calculate your "principle pay down" from the mortgage being paid.