I'll check it out.

First place to check is with your state agency that regulates business activity.  

You use your Airbnb / vrbo apps to accept the bookings, communicate, get paid, and schedule your cleaner team to change linens and check on damage.

Two of the owners are members here at BiggerPockets, and you can check out their website at https://astropropertymanagement.com/@Zachary C.

I've been checking up on it since December, 2017.

I would love to pick your brain about both of those areas as we have a few on our list to check out in both of those places. 

Check with a lawyer on that one. 

I would suggest looking through the SBA website for more information and always check the credentials of someone claiming to be a licensed real estate agent or broker online in the state website where they claim license.  

-Do I need to establish a separate checking account if it is going to be held in our names for a few months before we rehab / refinance?

I checked and they're No tax liens.Our neighborhood is doing very well with home sales.We have a decent relationship with him.