Hi Bettina,
Have a **** at this webpage, which give some useful informations:
****://***.fluechtlingsrat-berlin.de/akjungefluechtlinge.php
AKINDA is a network which could correspond to your request, here is the contact information:
AKINDA - Netzwerk Einzelvormundschaften Berlin
Ansprechpartner: Claudia Schippel und Barbara Noske
c/o Psychotherapeutische Beratungsstelle Xenion
Paulsenstrasse 55/56; 12163 Berlin-Steglitz
Telefonnummer 030 / 327 09 340
akinda@xenion.org
Have a good evening!
Caro