Awful. After 1 year of not using this app due to Corona I was trying to book my trip now. The interface hasn't asked me to validate my ID until the reservation was canceled. Why wasn't I asked to do this earlier, but just instantly before my trip? Secondly, why do you need to validate my ID if you already have my credit card? Thirdly how does this comply whith General Data Protection Regulation of EU? How is my data stored and kept secure? I'm super skeptical about it.