Hunting for housing in Berlin

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Am apt-hunting and, surprisingly, it is not easy finding an apartment in Berlin. So many of the advertised spaces have spotted vacancies -- a weekend free here, a week or two available there -- due to the nature of tourism...it seems no one rents by the month. Blasted! When I do secure a place I hope my landlord isn't like Pearl here (see video):

The Landlord from Will Ferrell