Is this perhaps what you´ve heard about?
Arrivo Berlin offers 3 to 6 week Praktikums (internships) in the Handwerk, Industrie and Pflege sectors (Manual Trades, Service Industry and Nursing/Home Case). You have a selection of preparatory courses beforehand as well: German Language, an introductory course for handcraft, and a course in a specific trade.
Their requirements are B1 level of German and access to the job market.
Here is their contact information:
Köpenicker Str. 148 / Aufgang C, 2.OG
Tel.: +49 (0)30 69 50 89 00
Mo - Do: 10.00 - 16.00
Fr: 10.00 - 12.00