Even then, all of my booking.com clients are American I offer a 25% discount 0-3 days out. add a 15% fee which essentially covers your commission. set up with one hour to cancel, flexible / strict option but no refund 60 days out or later. sync it with Airbnb and or the other ones you are doing.

Anyone have a cheat sheet or checklist for covering your ADU bases?

Hostfully seems like it will cover the basics we need, plus it has some unique features that others didn’t offer.

So, I am indeed getting monthly payment from my buyer that would cover both monthly mortgage payments and also provides me interest only payments on the difference between the sale price and mortgage payment. 

Given your assumptions, you are not going to be able to get enough of a loan to fully cover the rehab, even with a hard money loan, so you'll need to pull in cash from elsewhere.One possibility is to have your mom sell you the house with a personal loan, not one attached to the property. 

It typically covers the structure under construction, materials, and equipment on-site, in transit, or stored elsewhere.

Quote from @Erick Pena: A "good" rental property is one that covers all expenses (mortgage, taxes, insurance, maintenance, property management fees, and any other costs) and still leave a surplus (commonly referred to as cash flow).Calculate cash flow as: Cash Flow = Rental Income − Operating Expenses − DebtThere's much more to it, but that's the basic idea.

I have started looking for another insurance quote, hard to find one that covers multi family.

The HOA covers all the exterior.What was the outcome?

Just focus on running the numbers carefully to ensure the property cash flows or at least covers expenses, and don’t hesitate to lean on resources here for advice.If you’re financing, look into FHA loans, as they’re great for first-time buyers purchasing up to 4-unit properties with low down payments.