We get a fair number of Chinese, usually going to or coming from Yellowstone and very few of them speak English. Sadly, I don’t speak Chinese (or any other useful language). Nonetheless, we manage to communicate enough to get information across and most of the folks who stay with us can make efficient use of Google Translate. Word of warning, though–Google Translate is not great with asian languages and we’ve had more than one incident where we and the guests blinked at each other in bafflement at what came through. The guests are, for the most part (mercifully), tolerant of our shortcomings on the issue.
You can decline, though I am not sure how Airbnb will feel about it-- but if you are really not comfortable with the situation, it may be worth it.