Thank you for your response. I understand the instructions, but I don't understand what a "strict 50% up until 1 week" policy means in practice? I would, however, be cancelling over 8 weeks in advance, and the reason is that the description does not mention location at all. I found out later that the room is located in an area consider by many sources as the worst and most dangerous neighbourhoods of the city I am planning to visit. Description claims that it is good for families, but this seems highly unlikely everything considered. I'm totally fine with losing the airbnb fee, but not with losing 50% of the actual sum.
Also, If I am not checking in at all, how can I try to get the rest of my money back after cancelling?