Awful check in. The flat opens with a self check-in system through an application. Unfortunately the digital code was WRONG and at 1am after a long flight we were not able to access the flat. We tried to communicate with the host but no one was available (only a chat) and no one could solve our problem. We finally had to look for another hotel very late at night. This was really unfortunate and it ruined our arrival in Barcelona. The host refunded our stay for the first night and apologised, but still very bad experience.