Hello @Lorenzo131,
This isn't Airbnb customer service. It's a forum where hosts help each other and can give advice from their own experience.
If there's a problem with your account you should contact Airbnb customer service.
Type "contact airbnb" in the "Search the community" box on the page where you wrote your question.
Then click on the item "Contact Airbnb: A Community Help Guide". It has phone numbers and information on contacting then on Twitter and Facebook.
I did go to your listing and the price I see is the one you want for the 7th to 9th of July. The €102 instead of your 99 is due to Airbnb's 3% currency convertion fee.