Fantastic location! It is literally in the center of the city. The apartment was clean and well-maintained with small flaws.
The apartment is operated by Interhome. They require you to register in their system with your personal data and card for further payments (not entirely clear what they would charge you for). They also have an age restriction, a term I couldn't find on the Airbnb page. The communication with Interhome was cumbersome and slow; it is rather them asking you to do things than answering your questions. Once I got redirected to the key-holder, she was responsive and clear in her communication, she was very helpful and answered all the questions Interhome didn't do.