You are not required to report this rental income, per IRS Pub 527 Used as a home but rented less than 15 days:
If you use a dwelling unit as a home and you rent it less than 15 days during the year, its primary function isn’t considered to be rental and it shouldn’t be reported on Schedule E (Form 1040). You aren’t required to report the rental income and rental expenses from this activity. Any expenses related to the home, such as mortgage interest, property taxes, and any qualified casualty loss, will be reported as normally allowed on Schedule A (Form 1040). See the Instructions for Schedule A for more information on deducting these expenses.
Be sure you have documentation for the purpose of the payments and the reason for excluding the income (including the IRS reference) should the IRS have questions.
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