We informed the host that our plane would arrive after 17:00, so they sent us a code to retrieve our keys, which did not work, and an emergency number to call, which was not picked up. My girlfriend and I both left voicemails, but we did not hear back for hours. We also had Airbnb support try to get into contact with the host. Once we were able to get into contact with someone, we were given a different code to use in order to access the emergency keys, and we were told a room number. It didn’t seem like the room was intended for us since the welcome instructions packet in the room had a different guest’s name on it and was in another language. We were also told our actual key would be in the apartment then, so we could return the emergency key, but there was no other card there, and the power does not work in the apartment without a key card.
We were unable to explore Barcelona as we had intended. After we left, they sent a bill for damage we did not cause. The apartment itself was very nice and in a great location, and we wish we could have enjoyed them. The check-in struggles and ridiculous lack of communication prevented us from being able to do anything while visiting. If you plan to arrive after typical office hours (including if your flight might be delayed as ours was), strongly consider having a back-up plan.