The lease I use requires any added occupants go through standard screening process and boyfriend would fail that screen. 

Tell her you've discovered the property was not properly registered and that it's not safe with all these electrical issues.

While my helper was on your standard rental showing appointment, talking with another interested party, a young woman unlocked the window in one of the bedrooms in the back of the house and the top part of the window slammed down on her fingers.

Tenants learn from our behaviors, we set the the standard.

That’s when they discovered the roof was mostly in the basement.

I am not sure about a rent by the room comparison vs their standard single family or small multifamily estimate, so I would check with potential lenders to see what they will consider.

Personally, I have very high standards.

This sent me down a path of discovering pros and cons of solar on investment properties.

If you can't do the standard 20% for rentals, look at duplexes where you will live in half and rent the other half. 

However you also have to consider what you're going to do when your tenants move out at the end of their one year lease, and how long it may take for you to find new tenants that are suitable to your standards.