The rule you may be referring to is called the '14 day rule' which means you rent the property out less than 14 days the entire year, and use it for more than 14 days yourself.
This doesn't sound like it applies in your case, and your STR is 100% Business, with no Personal; is that correct?
In that case, you would file a Schedule C to report income/expenses.
You could use Schedule E if you be sure to indicate that you 'rented all year' and had 0 personal days; in other words 100% business use in the Property Profile section.
Here's some Tax Tips for Airbnb, HomeAway, etc. that may be helpful and also detailed info from the IRS on Renting Vacation Property.
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