Response from Sarah:
I apologize for any trouble the guests had with the apartment, but they were never addressed with me. I cleaned the bathroom thoroughly prior to their arrival, but it is a shared space, so it may not have been up to their standards after 5 days, for which I am very sorry. No one in my apartment has ever seen a cockroach in the four years we've lived there, with the exception of one 5 floors below our apartment after the rain, and yes, other people drink on the roof, but we cleaned prior to the guest's arrival, and as a shared space, it does sometimes show signs of wear and tear. I only wish that Sebastian and Benedicte had brought these concerns up with me so I could have helped.