It certainly does make it challenging if you and the guest do not speak a word of each other's language but, as others have said, there are ways to communicate, at least in writing, but also there are apps that allow you to do voice translations should you need that, for an in person check in/tour for example.
I would base my decision not on which language the guest communicates in but HOW they communicate. Try to have a conversation with the guest via the Airbnb messaging system, asking them whatever questions you feel necessary. Translate the responses and from those you can judge whether this person sounds like a good guest or not and, very importantly, understands the listing and the house rules.
@Patricia3197