Almost everyting was fine except check-in.
When I arrived at the Airbnb house, the lock did not work. So I sent an Airbnb message to the host, but the host didn't even check the message and I couldn't get any reply.
After calling communication host several times, I finally got into the house after 1 HOUR.
The host said key locker was broken but they didn't know it! Even worse, they didn't sure about the password. They gave us 3 passwords..
I think hosts(esp, communication host) should be responsible to take care of their customers.
I hope hosts do not make same mistake to other customers.