Which country to search Airbnb from. Airbnb ranks listings, converts prices and shows availability differently depending on where the visitor is, so a Paris search seen from France is not the same result set you get from the United States — different ordering, different totals, sometimes different listings.
Pick the country your buyers browse from. The scraper reads that country's own Airbnb site (airbnb.de for Germany, airbnb.co.uk for the UK) and returns what a visitor there actually sees.
Leave it empty and it follows the language above, so choosing German browses Germany. Set both when they should differ — an English-speaking analyst researching the German market, for example.
China and Russia are not listed: Airbnb withdrew from both in 2022 and a search from either returns nothing. So Russian and Chinese, left to follow the language, browse the United States; pick a country here to browse somewhere else.
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