You could ask that they put a year or so of savings into a separate account on which you have view access or receive a monthly statement so you can see they have the ability to pay future rent.They aren't going to last without other income or savings with income at 1.25x rent.

A lot of STR investors prefer to sell off-market so they don't have to shut off business during tours, and I'm lucky to get access to a large majority of those deals in CO.

You should not have allowed access and now you are going to live the old adage of "it's easier to give slack later than to real it in." 

The course heavily relies on cold calling and emailing, which hasn't been effective for me as a novice.I'm considering a different approach, such as arbitrage, as it seems more accessible for a beginner.

If the residence is inside a gated subdivision or a controlled-access buildingthat is governed by an owner’s association, a letter from the association acknowledging the use and grantingaccess to occupants of the rental unit will be required as part of the application.A short-term residential rental requires a Conditional Use Verification (CUV).A short-term rental use is unavailable and prohibited within a residential unit or a room within a residentialunit that is located in an apartment building.

Imagine a real crisis where they couldn't get the grid back up, and you couldn't access your accounts, etc.  

However, in the event of an emergency, the Landlord and/or his agent has unrestricted access to the property.

Real- Estate  is a lot tougher game now because of technology now allowing buyers, sellers to access the market using the internet without using agents but  you do have hot areas that can support  more bodies .

A renovation company that has already completed over 350 renovations for us will quickly do whatever touchups/repairs are necessary so we can get the property back on the market.Use electronics to control access and reduce turnover time.

Also where can I access your extension?