Response from Federico:
Ms Rosekain stayed at my place for a total of 6 nights. During this time she and her family did nothing but expressed how much they like the place. In no moment they gave me any negative comments, on the contrary they seemed to enjoy all our facilities quite a lot.
Just a few days after checking out she sent me an email basically asking me for $200 or she would go and post a negative review on Airbnb. This is what I call blackmail.
I refused to do this and surely she went to post a negative review of the place. She totally forgot to mention all the positive things of the place and how well we treated her and all the considerations we had for her and her family.
I have the email she sent me as evidence of this.