Some would argue it doesn't work anywhere, @Iva16. Be sure you read the terms. The most important is this: It is not insurance. "The Host Guarantee is not insurance and should not be considered as a replacement or stand-in for homeowners or renters insurance."
But there is no country excluded, that I can find, in the Host Guarantee. It should cover the Czech Republic. Read about it here: https://www.airbnb.com/guarantee