Hello Ciro,
I'm Niko and responsible for the DIG-PKU Rhein-Main (Frankfurt) region.
But happy go give you an advice about the PKU ambulance in Berlin.
In Berlin the metabolic ambulance is part of the Charité. The page seems only to be available in German:
Hopefully a browser integrated translation option or Google translate will help you.
Wish you all the best for the start in Germany and for your little girl. Feel free to post you questions here. The community is happy to help
Best,
Niko