Occasionally, the owner would want me to just hire an electrician or plumber, etc., if the job was something he didn't want to deal with or knew how to do.

One has been paying late but she had did that occasionally before coronavirus hit.

The tenant has access to backyard (not in lease but offered as a freebie) it's in decent shape with not trees or plants whatsoever but my neighbor's back yard is lush green and some of his plants creep into the backyard.There will be occasional uninvited guests such as Centepedes and Beatles when the tenant opens his door.Now they are asking me to call in for an exterminator,the previous tenant never once mentioned it to me.Its not an infestation so I think it doesn't require me to call for an exterminator,it's not an infestation per se.How do I handle this demanding tenant?

You can't grow a flourishing mustache and make extravagant promises about your "gently pre-owned vehicles" as a used car salesman.

the agent I was working with would occasionally share a blog post on his facebook page.

Since the topic in next link comes up occasionally, time to add it to this list:http://www.biggerpockets.com/forums/41/topics/70371-leaving-old-owner-on-as-tenant-after-foreclosure

But honestly, besides the occasional light bulb replacment, smoke detector battery replacement, HVAC filter replacement, your monthly repairs isn't all that much. 

And then occasionally you get a big expense like a water heater goes out or furnace.  

Meaning that a portion might not be able to be expensed if you're doubling the trip as a vacation, and it can't be anything extravagant (there's a lot of nuance with this).

I like long term rentals, and the occasional rehab.