She told me personally that you cannot reduce 10 years of research into a 12 minute  TED talk!  

Unit 4 - short-term rental (this would be best for a unit with a separate entrance so you reduce the bother to other tenants because the changeovers will be more here)Is anyone doing all three (LTR, MTR, STR) in their multi or house hack now?

I'd also suggest considering a partnership if you feel comfortable with that in order to reduce the risk completely on you. 

That said it is possible that you need to evaluate your stays and decide if it is worth taking shorter stays or sticking to some longer stays to reduce your time commitment and maximize the revenue for time invested.

SO many more options and the reduced responsibilites and work loads are under valued until you deal with them.. lol Also when you factor in management fees it can be quite comparable in net proceeds, without the wear and tear on the property and furnishings. 

I've seen a few hundred dollars for lease renewals versus they may charge a month's rent to find a tenant and you are reducing the risk of having a bad tenant with the turnover.

This reduces their upfront cost so they don’t need a large deposit.

Remember that the leveraged purchases are not going to add significant cash flow immediately and borrowing against existing properties will also reduce their cash flow.

If your leasing application process is thorough and well thought out, and if your lease agreement has been well drafted by your local attorney and if it includes clauses that permit you/your property manager enough latitude to maneuver and anticipate undesirable tenant behaviors, both actions and inactions, and you have operational processes which align with enforcement of your lease, then you've done all you can do to reduce this inherent risk of an undesirable tenant.  

Showing ID is not only a safety measure for yourself and the other person, it also helps to reduce fraud if someone is unwilling to provide identification and is being this difficult with a simple ask, then I would also question whether or not they would be a good fit as a tenant