I am not sure what went wrong but lack of communication did not result in a good experience. I am assuming its one off day and host had some emergency, hope all is good now.
I had to book last min, first I sent a message to the host but didn't get reply. Listing had "Instant book" on so I booked it. Host had all the details very nicely on the page, it stated there will building staff to help check-in, details for self check-in will be communicated through text/email/phone. I did not receive any communication for self check-in or reply to messages I sent till few hours before check-in. Didn't want to drive all the way and get stuck so I contacted Airbnb, who were not able to contact the host either. They cancelled the reservation and I had to hunt for something else last min.
I hope this is just one of the rare cases when host got stuck with some stuff and was unreachable, I wish them well. We all get into such situation sometime.
(Removing "instant book" from the listing in this case would have helped)