I've had the same question and have had countless house hackers describe to me why house hacking is a successful strategy even if you don't make money while you're occupying one of the units. 

So without further adieu, here are the TOP areas to focus on after digesting all of the $'s and cents when committing to a mortgage lender or broker with what is likely one of (if not the) most significant investments individuals can make. 

They did not finish the work and I ended up buying the property with one APT half way done because according to them no contractor was willing to finish the work for nineteen thousand dollars.

I'm wanting to offer my guests a discount for extending their stay, or coming in a day earlier, to help cover one night gaps in my calendar.

Your current setup doesn't really keep your business and personal assets/dealings separate.To do so, you'd need to transfer those properties to an LLC you own or create a new one for that purpose.If there is a lawsuit, I'd imagine that your name, as the owner,  would appear in the documents filled.Just my 2 cents, I am not an attorney, nor a CPA

On one hand, Airbnb allows me to leverage my passion for unique design.

My assumption is the owners did not wake up one day and this hit them square in the face.What’s the story?

You'll find agents that are very cheap and agents that are very expensive, and everything in between.And like any other service or product you'll find ones that are really ****** at their job, and ones that are absolute rockstars.

If you can't find a solid one, don't invest in that market!

Seems like BP offers good ones and you can always customize them to your liking.