Airbnb's Android app just scored a significant refresh, including some major design tweaks and additional tools for hosts. Version 2.0 adds two features that should make it easier for property managers to interact with guests efficiently, including the ability to update calendar availability and pre-approve users from any compatible Android handset -- that latter feature hit the iOS app in December. There are also quite a few bug fixes in tow, according to the release notes -- push notifications should now be working, for example. The focus here is on host usability, however. According to a TechCrunch report, only five percent of hosts current use the Android app, and while these additions should streamline operation, they're unlikely to account for a major shift from the web interface.