Response from Tania:
I have been having trouble with another tenant. He doesn't follow my instructions regarding cleanliness.
That has nothing to do with the fact that Sandra was very ignorant while reserving. I had to answer many of her e-mails and it took her long to figure out how to reserve online via airbnb (like if its rocket science, mind you).
Because of my other tenant's lack of cleanliness, I accepted to refund Sandra for her non-stay but she said she would come back to stay to my place.
She also menaced me to put pictures of my place on airbnb and to tell airbnb that I had lied about my mother living upstairs. The poor girl can't make the difference between two listings.
So it is up to you to live with someone so illiterate and retaliative.