Dear William,
I am sorry to read that you are facing similar situation as I.
Unfortunately, I did not fix my problem yet. I was hoping someone would advice me what shall I do regarding this, but you are the only person who replied to my request. It is an big issue, because I was never informed about additional fee cost via email or anything similar, therefore my only option in this moment is to raise my price, but it is bad option, because I will lose gusts.
I lost more that 80 euros per 7 days on this mysterious additional fee.
When I went to my bank, people told me that the airbnb changed transfer bank. They have three banks which services they were using, the one they used until now did not charged transfer, but for some reason, they changed transfer bank (as I understood this one is located in Paris) and charges every transaction 10 euros. I did not try pay-pal option yet, but I will try to arrange it during the week.
Let's keep in touch. If I have any additional information, I will inform you.
My best wishes,
Aida