I like the minimal design of the website. Quick feedback
- Add portfolio
- Add tech stack
One thing that I think is most important and missing here is the portfolio. As it will provide context and proof of your skills and capabilities from past projects. Also if you can get testimonials from people you've worked with in the past that's great too. The tech stack thing is a mixed bag since it can "disqualify" you from gigs you might be able to handle, but most people seeking freelancers will be looking for a specific stack/set of skills and if you can immediately show them that you "fit" it will help.
You've got a ton of followers/traction on github so at a minimum i'd say highlight those things you've had success with?
Have you actually been to Berlin or Germany in general before? Do you like it? Or is it because Merkel welcomes every foreigner currently... There are other cities in Europe that have a better tech scene compared to Berlin.