Healthcare is definitely not "free" in Germany. In fact it is quite high compared to the UK. If you are a freelancer in Germany you will have a relatively large upfront cost compared to say freelancing in the UK.

Bring on top of that the Germany tax rates and you will quickly be taking less home than in say the UK.

Rents are also not as low as it previously was. It has steadily been rising and buying a place is also out of the question now given how the property market has performed in Berlin.

Don't get me wrong, I love Germany and have personal connections to it but one needs to take everything into account when you make a move to a new city.