The guest sees hosts' star ratings, but we never get to see how the guest has been rated by past hosts. Both sides should get to see how they have been rated and the percentage of thumbs up to total stays.
Also, implement a "Super Guest" badge for guests who have received 80% 5-star ratings, have prompt response time, etc. Similar criteria to a Super Host.
And allow us to Instant Book only Super Guests or previous guests.