What Helen suggested will get you high hopes with no follow up. Airbnb does not engage in helping hosts figure out how to plan their actions in situations like this... I would be very very surprized if Airbnb got involved in transferring guests from one profile to another. I got NOWHERE when trying that course of action. ZERO...
I have been in the process of doing this very thing and what Robert suggested is a good course of action. The co-hosting thing is working out very well... I would suggest to do this for the remaining amount of guests already booked.
Then to continue for new guest bookings is for the new owners to start their own new listing and within the first few lines of description mention that it's been prevously rented under original owner and give the web address of the old listing's profile so they can ascertain for themselves. Make sure the old listing is still in 'active' mode for awhile after your so the new people can see it. Then when the new owners get their own reviews going you can inactivate your old listing and you're done and you've helped the new owners nicely. Take a moment to conceptually wrap your head around how that would work out. It's worked for me quite well. And I'm not breaking any rules, ethical or absolute. By the way reviews are not only about a host performance they also reflect the quality of the home, neighborhood, value and location. It's certainly better to know something than nothing...
It's very hard to get ahold of Aribnb and when you do it's all about solving problems of ordinary nature, not brainstorming about how to help you solve your unique situation ouside the box. Sue I wish you good luck -
