It does seem to depend on the country. I've had great success/response so far in Western Europe (France, Belgium) but my attempts to book something in Greece we

It does seem to depend on the country. I've had great success/response so far in Western Europe (France, Belgium) but my attempts to book something in Greece were met mostly with rejections. It seemed to me that they don't bother to update their calender, rather they use the Airbnb platform in a limited way: to put out an advertisement. This makes it impossible to search for vacancies quickly, you still need to contact every single host to ask if you can stay. On the plus side, my best Airbnb experiences were in Greece, there were some fantastic hosts (and houses).