> look at listings of new apartments

And even that is fraught with problems, because in my neck of the woods (Germany) we generally do not buy houses/appartments furnished (and renting appartments furnished is also an exception and not the norm. Even kitchens are empty rooms without cabinets and appliances.).

Edit: Even though the AirB'n'B methodology is not perfect, I agree with some of the conclusions. Just like radio/tv has smoothed out local accents and dialects within a country, the internet produces global trends. This is not all bad.