It provides housing when we have limited supply, it's a good way to find tenants and make friends, and it produces a great ROI (if managed correctly) because the rental income is generally higher.

Anyone have experience as HOA Management in what happens to revenue when property owners losing their houses?

CA doesn't recognize series LLCs, so yes, you would need to be careful with costs for any structure that you put in place. 

My Vrbo account manager also said offering a 10% weekly discount helps.

I have to slow down and really analyze the cost vs. benefit before jumping in.My personal life is the same.

It does not matter if you have 1 or 100 accounts, what matters is that you do the bookkeeping to keep track of your costs, expenses and income for the property.

My son is the property manager, and house hacking with three roommates.

I talked with a manager at my local KeyBank and she told me "There is no such thing as a DSCR loan.

What about the down payment, the closing costs, the rent ready costs, the commission to rent out?  

With a LTR utilizing MLS is cost effective, you pay 1/2 to 1 months rent on a 12-24 month lease.