In many Eastern European countries, there exists one room where the toilet sits, and another room where the shower/bath exists. Because of this, when travellers filters for 2 bathrooms, what you end up with are a lot of apartments with only one toilet - but the host has listed it as 2 bathrooms because there are literally 2 rooms. This makes the # of bathrooms filter pretty useless, as the traveller is probably looking for apartments with 2 toilets.
Airbnb should change the text, and then send an email to all hosts in Eastern Europe and ask them how many toilets do they have, and not how many bathrooms they have.