I recently had to do the same; cancel bookings and unlist my property until a time when my husband's illness allows us to open up again. Airbnb demanded that I send Dr's reports to them to prove my husband had been genuinely diagnosed with cancer. I find this incredibly intrusive. Not only did I have to send them reports by email (only after getting put through to a supervisor), but I was told that they may or may not delete these documents. So not only was I penalised for cancelling my guest bookings, after speaking to Airbnb on the phone and asking them what to do - again utterly unhelpful, I've had to supply sensitive, private medical information with them.
I am seriously considering not being a host ever again.
Trish.