So the main advantage of a DSCR in this case is just the fixed rate? 

The market is saturated with STR's further from the beach and attractions, so my advice is to be picky about your location and underwrite the numbers carefully to make sure the investment will be profitable. 

I think your last point about starting near infrastructure and moving backwards is very interesting.How much value do you put on a property being on a main vs side street?

My wife and I own four units and we’re making the jump to double digits. Do you take out a second mortgage on an Airbnb that you never wish to sell that’s almost paid off  or do you take out 100 grand against your pri...

Its certainly not "guaranteed return" - thats a word to always stay away from in real estate (in finance or even investing in general)high level - its because HMLs are going to be secured by the real estate, meaning in event of default, the lender can get the property to be made whole - somewhat trust is involved, but thats the main mechanism behind it

These employers frequently attract new residents and create a steady influx of good quality renters and prospective tenants. 5) The Albuquerque metro area and Central New Mexico enjoy over 310 days of sunshine and a mild climate year-round.

I think the main thing would be access to the books to make sure of the expenses.

A $200,000 duplex might have identical rents in municipality “A” and municipality “B” but the property tax rates will vary, local regulations will dictate licensing requirements, labor rates will vary & the particular location will dictate insurance premiums since insurance carriers will weigh local replacement costs and whether the municipality is viewed as being a “plaintiff friendly” in arriving at insurance premiums.Better situated assets will attract better tenants.

What is the main hang-up with financing, when it comes to adding bedrooms?

I have not seen any "main stream" versions of this just back country engineering but it's a solid concept and works well.