Technically, per Section 280A(g), you would not include the income from the seven days of rental use in 2019 in your gross income and you would also not be allowed a deduction for the seven days of rental use in 2019 (i.e., you would not prepare a Schedule E for 2019 for the 2019 rental use).
It would be actually be wise if you could somehow secure separate payment for 2019 and 2020 because there might be a mismatch if you exclude income allocable to 2019 but receive a tax reporting statement for the entire amount your renter paid.
