As a PM at Airbnb, I would prioritize addressing the issue of customers being unable to check-in before addressing the issue of customers having a dirty place. While both problems are important and impact the customer experience, the inability to check-in is a more critical issue that can lead to immediate frustration and dissatisfaction with the service. To address the check-in issue, I would first conduct user research to better understand the reasons why customers are unable to check-in. This research could include surveys, user interviews, and analysis of customer support tickets. Based on this research, I would identify key areas for improvement, such as improving communication with customers before their check-in or simplifying the check-in process. Once a plan is in place to address the check-in issue, I would then prioritize addressing the issue of customers having a dirty place. This could involve improving the cleaning process or providing additional resources to hosts to ensure that their places are clean and ready for guests. Overall, my approach would be to prioritize the issue that has the greatest impact on the customer experience and work to address that issue first.