We got lucky with low rates still in place on one property then found a unicorn subto in Post Falls recently.  

it was just a temporary quirk when rates were low. if your mortgage payment net of rent is equal to or less than what it would be renting, it's a better choice.say you could A. rent for $3000, or B. have a $5000 mortgage and collect $2200 in rent.

Notably, personal visits for maintenance purposes do not contribute to personal use calculations.

At that point, you may find yourself paying a substantial sum to a CPA to rectify the situation, whereas you would have paid a fraction of that amount annually for professional guidance—similar to the concept of preventive maintenance versus repair maintenance.

Not too low either, you don't want to go with someone who is just focused on price as this is a quality of a not-so-great accountant.

Any and all repairs and maintenance must be paid for from the SDIRA.

I do not intend on selling this one since this property has a good bit of equity and is low maintenance Lessons learned?

I also bought Brandon's "The Book on Rental Property Investing" book as well as "The Book on Investing in Real Estate with No (and Low) Money Down" but haven't started reading them yet. 

What are good indicators of low supply high demands? 

A lot of the neighborhoods you can find the great deals on paper, but you do end up with low ARVs and unreliable tenants at the rates they can rent for.