Take a look at AirDNA, the enemy method, STR Insights to get a better idea. 

Several methods come to mind for the ADU.   1) a regular or periodically adjusted flat fee (based on an estimated usage); 2) factored into the rent (essentially the same as a flat fee); 3) percentage proportionally based on sqft. 

Here are some excellent practices to remember if you decide to employ the home hacking method again:1.

I hear different things when educating online on what is the best method for lead generation and I’m not sure where to pull the trigger.

It's still the same methods used for the last 5 years.

He advised me to file based on the accrual method? 

The other method is do a straight cash out refinance up to 80% where you can use it for renovation and allocation the remaining funds to invest.

Have you had any issues with the city regulations regarding STRs using this method? 

Probably has a better chance for higher cash flow in certain markets with that method as well

If you're looking for good Morning Meet Ups to meet other investors, here's a couple.Tuesday 8AM - Jonathans Restaurant Matthews, NCWednesday 8:30AM Rock Hill Diner Rock Hill, SC (We Host this Group)We practice the BRRRR method and have a full team.