I dont know how many units you are talking about, my biggest problem was tenants having easy access to me.I finally decided to use a software and got an internal property manager so moved away from it.Currently setting up the maintenance request portion of it, so will see how it goes.

I had them drive past and refuse to stop even when a concrete truck was on the way.

If you can hop on a $100 non-stop flight, nbd.  

I helped the owner structure the seller finance and off-market offer to be closed more easily (more accessible to the buyer) through mixed financing and a lower price.

I was shocked to see that given that they stopped paying on their other notes...unless its as you said, pay old investors with new investor money.

I also have the text logs, since I stopped talking to him on the phone so that we would have a record of his communication with us concerning the rent.  

Would it be a good idea to refinance and get access to that equity, or don’t and keep the favorable interest rate?

Received access to mortgage portal to ensure all payments are made (including escrow).Anything else here I should do or not do if acquiring for the long-term?

Often times, if title notices there is no obvious access, they will note that as an exception on Schedule B. 

Quote from @Daljit Singh: Hi BP, I am currently house hacking a duplex in Union City, NJ, and unfortunately, the tenant stopped paying rent a few months ago.