Very recently Airbnb changed their interface and for the life of me I can’t find where to edit the description, I can only edit the summary. Would appreciate if someone could direct me 
P.S my listing in works in progress, not live yet.
On the app it at’s the top just under the title.
I have the excact same problem, very frustrating. I recently signed up as a host, and it was easy to write a description, but it seems as if Airbnb forgot
to install an editing function…it’s nowhere to be found. :-/
I contacted AirBnb support via twitter and they told me that I have to publish a listing before I can write or edit the description.