I currently have SFH and multi-family long term rentals and I partnered on a short-term rental.

What happens during periods when the demand for legal work is lower?

In some places there are a few days grace period to allow for rent that is sent via mail (which I don't get because if it is due on the 1st, plan ahead). 

If this were my property, I’d run a detailed rental analysis (from what I’ve read in Forbes) to see if the short term route could outpace traditional leasing.

In short, yes PS can do everything DM can do and more.

What is the time period required before refinancing?

It simply depends on your time frame, when you want to actually begin renting the property out short term, and what the loan terms are.

@Heather Bailey When house hacking with a separate rental unit, ensure proper insurance by obtaining landlord or short-term rental coverage tailored for Airbnb activities, in addition to your primary residence policy.

I plan to kindly follow up with collecting.Trust but verify - I looked it up & there was a news story about itAnyone know of any resources out the there to help him in the short term with rent? 

The short answer is being a middleman between a buyer and seller and you keep the difference in price.