Happy the author who finds the appropriate sources! And, indeed, without much trouble, the relevant sources for the issue raised by the title revealed themselves to me and helped me shape an image. The story began when surfing – naively enough – the Internet and found the article The journalist Hal Vaughan:” Coco Chanel was a Nazi spy. She hated the Jews.” (author: Iulian Ioncea) posted on the website of the newspaper Adevărul (August 14th 2012). An article like any other, nothing special, about an anti-Semitic Coco Chanel.

photo taken by VancityAllie, on August 1, 2010, CC licensing

Tidbits savory with garlic and vinegar or satiny with schmaltz may pique the appetite, but for many Jews, no real meal begins without soup. So for much of the calendar, stocks simmer on the stove for hours, and out of the oniony fog come golden chicken soup, earthy mushroom and barley, tangy borscht--brought to the table steaming hot.

photo taken by Cara Faus, on September 1, 2010, CC licensing

If lox and cream cheese is Yiddish cuisine's answer to ham and eggs, isn't honey cake, lekach, its fruitcake avatar? Each is linked to a major religious holiday (honey cake at Rosh Hashanah, fruitcake at Christmas), and frequently given as gifts at those times.

A day-ticket (starting from 0:00 am to 3.00 am of the following day) for the farezone AB (this is the city-region of Berlin) is 6,30 Euro.

You'll find a tourist-ticket for 48 hours (Berlin CityTourCard AB 16,90 or a tourist-ticket for 72 hours Berlin CityTourCard AB 22,90) as well. These are valid for 48h or 72 h starting from that moment where they are clocked in.  You'll find more information on public transportation on the english website: http://www.bvg.de/index.php/en/index.html 

http://germanhistorydocs.ghi-dc.org/pdf/eng/English_Feuchtwanger10-3.pdf

Here you can find a guided tour for Berlin-Grunewald, unfortunately it is in german:

http://www.berlin.de/ba-charlottenburg-wilmersdorf/bezirk/kiezspaziergaenge/021109.html

Berlin-Grunewald is a very wealthy area of Berlin, a certain percentage of its inhabitants were jews, among them Walther-Rathenau, Alfred Kerr, a very important theater critic in the twenties. His daughter wrote the book "When Hitler Stole Pink Rabbit" and many others. Berlin-Grunewald is a villa quarter, and if you like to see mansion in art nouveau-style, take this tour!

You can find the letter here:

http://germanhistorydocs.ghi-dc.org/pdf/deu/German_Feuchtwanger_10-3.pdf

and here is his address:

Perhaps you know this already: I.G. I found Fritz Lang, M - A City Seeks a Murderer there and was able to download it.

http://archive.org/details/movies