As an Airbnb host, with code 54, you would enter your information as a self-employed business. 

To do so in TurboTax Self Employed online edition, go to:

1.  Sign in to your account and select Pick up where you left off

2.  At the right upper corner, in the search box, type in schedule C and Enter 

3.  Select Jump to schedule C, follow prompts to enter your business information