Berlin Bakeries, breads, ingredients?

Hi Everyone,

I'm going to be in Berlin for a week (East near Alexanderplatz for a few days tourism, then in the South West near Dahelm for a few days at a conference) starting this weekend (March 19).  

I know that if I was going to Paris I'd have a longish list of bakeries to which I'd need to make pilgrimages.

Do any of you TFLers know of bakeries in Berlin that one really should visit?  If I'm seeking out a Werzelbrot (related to Pain a l'Ancienne, I'm told), are there sources?  

Or are there breads that are available in Berlin that might be impossible to get elsewhere?  What characteristics (of bread or establishment) should one look for, when seeking out a Volkornbrot or a Werzelbrot, for instance, to distinguish an excellent one from a mediocre one?

I also like to look for unusual and interesting local cheeses and other bread accompaniments or ingredients when I'm in a new place.  Recommendations on this are welcome too.

Any advice would be sincerely appreciated.

Thanks in advance!

Mason.