Houfy.com, you will receive a notification of the request to book, but you have to accept or decline the reservation prior to your calendar being blocked or  the guests credit card payment going through.

I think the more important question, is which components of managing an STR do you feel comfortable with (and want to do) and which do you not?

Will watch for notifications.

I have tested it on my existing rental and BRRRR properties; it is incorrect more times then not.  

no - not if you factor in closing costs, stabilization costs, rent ready costs, and all the other costs that typically get downplayed or ignored.hope this helps

Leverage is great, but not if it makes your deal lose money.

The most common claim of note holders being wiped out by foreclosure of superior liens is that they did not receive proper notification.  

Not opposed to that - but not if it means putting a huge down payment, my vehicles not being paid off, and a $3,000/month sabotage.

For WHEN (not if) unforeseen expenses come.

If it's zoned residential (R-3 or R-4) then a duplex is the maximum allowed units so a third unit is technically not allowed regardless of whether they tell you a permit is needed or not.