For the space y ou rented out to the renter, that space was "exlusive to the renter". I seriously doubt you used that space that was exclusive to the renter, for your personal use during the time it was exclusive to the renter.
Days rented is the number of days it was exclusive to the renter.
Days of personal use is the number of days you used that exclusive space for *your* personal use. More than likely, that will be ZERO days of personal use.
