Take an hour or two to education yourself on the subject.I cannot say if I would rent to them or not, as it depends on much more for me, such as: their pay (separate and together); their time on job(s); references; interviews; etc...

I recall there being a law in New York State that required separate meters if tenants were required to pay for utilities (which makes sense). 

I personally separate my rentals from my Airbnb because I buy in places that will make sense long term to a family and I create a cash flow almost passive income, on the other side I go to an area of town like near a hospital, college, downtown ETC... and rent there which in most cases will be CHEAPER then owning, I will not get the appreciation and some other RE benefits but Airbnb is not about that it's about cash flow and hopefully I buy right my long term rentals.

I would love to have a detached ADU, and a mother in law suite (basement) in a detached single family property to have 3 separate rentable units.

One of the major benefits to BRRRR is that it allows you to separate the purchase and the loan transactions.

If something goes awry, then we want separation from our personal assets.

Take down the 4-6 foot fence separating the properties and put up a 10 foot fence.

You can also create extra savings accounts instantly to separate funds.  

If it's a multi-family and the units aren't metered for utilities separately, you'll likely have to cover some or all of those expenses. 

Denver has endless burbs but Longmont is well outside of those and a separate market.