Using other loan types not only are non-conforming for you to occupy (DSCR), but the downpayment minimum and the rate will be much higher kind of defeating the purpose of doing a house-hack. 

It just seems hard for these sites to get enough travelers using them, unless you have a property targeting a very niche tenant type that uses a specific website to find housing. 

A big issue to consider is the type of insulation in the current garage.

I think someone being in an office onsite is key for these types of places.

There are many different types of Chinese cabinets.  

I recommend getting ahead of this by contacting AirBnB support.Share the documentation in the AirBnB message system.

What type of loan would be the best with the least amount down.

With 6 roomies, and possibly a lot of turnover, (Mi cocina es la cochina de nadie)Same for the restrooms, livingroom and yard.Maybe some maid service to keep the place(s) as desirable living space.I wouldn't not expect flop house types to be big on cleaning up other roommates messes .

What type of asset class do you think will thrive in a place like this?

These types of loans are not dependent upon your income but more on the cash flow of the property itself.