bagdadchild
Established
well they manage to ruin 35mm B/W films on a regular basis ...
I admit I have only had my E-6 and C-41 films processed by Pixelgrain, while B&W lab processing is mostly a crapshoot. Their small prints ("Abzüge") from slide film, 9x13 cm, are of fantastic quality, at least on matte paper.
For B&W you can also try the Farbumkehr und Schwarz Weiss Labor on Genthiner Straße 3. It's a small professional lab. I used them over a year ago for both slide, color neg and b&w. E-6 and C-41 came out fine while the B&W negs didn't turn out well, but in my case I would call it "user error".
http://www.diaentwicklung.de/
There is also a friendly guy nearby on Eisenacher Straße 36 who develops all films including Agfa Scala. Not same day service though but next day. Did a good job on Scala, other developing I have no experience with.
http://www.phototechnik-berlin.de