Nowhere on the Airbnb website does it tell you the Safari browser won't allow you to write a review about a stay. The host/hostess depends on these to be in good standing. I tried first on my phone and then on my computer, once home. No response to my request for help -- writing this in the only area I could find to actually contact anybody. A week later and no answer still.
My hostess happened to have a phone number for customer service (not sure where she got it) and I called. They had no work around for a way to submit a review w/o going on Google or Modzilla. I had no problem finding a place to stay, communicating with the owner, and making a payment with my Safari browser and so never suspected my browser was preventing me from interacting with them.
Very disappointed they can't do more to accommodate all their customers -- or at the very least tell people what browser is required. A disservice to the hosts and a disservice to the guests. A great company if one never experiences problems.