I tried to follow up on DCC with Airbnb. Answer see below, please. I told them I don't have a problem with my bank, the problem is with AirBnBs policy.
Does somebody have any advise with respect to the EC, for example, please?

Thank you for your email regarding the currency exchange.

Airbnb's answer:
When the currency in which you’re paying is different from the local currency of the country the listing is located in, we convert your payment using one of our exchange rates.

- We use the adjusted exchange rate if your payment currency is supported by Airbnb, but differs from the local currency of the listing.
- We use the base exchange rate in all other cases when we need to convert your payment to the listing's local currency.

Additionally, if you pay in a currency that’s different from the denominated currency of your payment method, your payment company (for example, your credit or bank card issuer) or third-party payment processor may apply a currency conversion rate or fees to your payment. Please contact your provider for information on what rates and fees may apply as these are not controlled by or known to Airbnb.

I also can suggest you to send us a Feedback regarding your experience with us. You can do it here