You did not make it clear whether that guest that couldn't check in was on the first day of your check-in guys 9 day abscence and that you did not know that he was not going to be there to check in the guest? Otherwise, I think finding someone to check in guests has to be your number one priority, even if your regular check in person couldn't make it, you should have found someone else to do the check-in... If you live in a larger city, there are many professional airbnb sitter services that can look after your apartment for you while you are busy.... (for example bnbsitter.com is great)