Ensure you have a clear contract that outlines the terms and protects your interests.

The key is to balance being fair with protecting your interests; consider what would motivate them to move and how much time they might need to find a new place.

And your downside risk is protected because it's a house for you to live in - it's an investment to remove your biggest expense.

We would be so grateful for any input, experience, or recommendations from homeowners or agents regarding what would be the preferred choice for 1) attracting rental guests in the short term, 2) retaining value for resale and not looking dated in 10 years, 3) protecting ourselves from accidents.  

He has tons on real estate investing. with a strong emphasis on tax minimization and asset protection.

You can explain that any changes to the lease must be carefully considered, as you want to maintain the original terms that protect your interests.If you decide to allow the change, you could draft an addendum stating that each tenant is responsible for their own rent.

Your criteria should not include anything that would violate someone's rights as a protected class. 

That would give you more rent coming in per 'house' and also help protect against vacancies (ie one unit might be vacant, but you still have rent from the other unit coming in). 

Here’s why:Liability Protection: By having separate LLCs, you limit the liability to the assets of each specific LLC.

Plus, protect our name.