When your rental income is 1.5-2x the mortgage payment - as is typical for highly refined STR strategies - they're basically not concerned about the mortgage payment.

Take it with a grain of salt as safety is subjective.You could also ask your Realtor and property manager their thoughts and maybe next time they are in the area to take photos.

But unless you take a chance you'll never know.Some basics on the home.

Like you we had 3 teams of two door knockers  2 for safety one women one man.. and we door knocked every NOD in our 2 mil MSA  all to boil it down to if we were very lucky to get 2 to 3 deals a month.. now we were a little different I only would buy very high equity deals.. and we leased back .. because as you state 99% don't want to leave.. 

Set up a basic system to manage your listing, update it monthly, and always ask guests for feedback—and don’t forget to casually ask for that 5-star review!

That is to basically keep you honest, so they judge can tell you tried.

What a great find, though - a single family turned into basically three streams of income, assuming you get an ADU permitted!

I don't think you are going to be able to get insurance for two separate living units in a single-family when they are both illegal and likely do not have the correct egress windows (basement) for fire safety which could subject you to huge liability if something happens to either party.

DFW Real Estate Investor Club.I think both are about $20 per event to attend the basic meetings. 

Once you know the "basics', you can then invest OOS more successfully.If you can't afford to invest in your home area, how will you grow your knowledge of an OOS if you take a shotgun approach to where you buy?