The best are:
- Psychiatry Freiburg (it's hard to get in for dx ASD at the moment)
- Isabel Dziobek (Berlin)
- Psychiatry Köln
It depends on the area you life. Others are also quite alright, but don't have the experience like Freiburg for example. Mannheim is also alright.
You just call there and ask how long you have to wait and maybe they'll send you some papework before and you should tell them as soon as possible that your family is non-German speaking and so on. So that they know, that they can't contact them for further questions about your childhood.
_________________
"I'm astounded by people who want to 'know' the universe when it's hard enough to find your way around Chinatown." - Woody Allen