They asked for a copy of my passport which they shouldn't have and they had an undisclosed security camera. This is in violation with the Airbnb policy. They also had another guest staying in the appartement without letting me know beforehand. I didn't mind but I'd have liked to have known that in advance.
Everything else was fine: the location is quite good, the appartement itself is absolutely stunning and the hosts seemed nice. I just didn't feel very safe.