I get so frustrated with the airbnb site (probably because I ran a web development agency for 20 years) but this is one of those things that is just irritating.
When you log into their system as a host and click MESSAGES it defaults to TRAVEL and I have to click to HOST. This is just poor design. If I'm logged in as a host, have the messages default to host and remove the necessity to click it.
This is just competent UI design.