Bullshit
போஸ்ட் செய்யப்பட்டது Shakir G அதில் ஜெர்ம்னிஅமைப்பு
You are really German? If she is able to pay an apartment, and her salary is enough, she can live, wherever she likes - only official register at the Meldebehörde - thats all.
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Usually, the Au-Pairs live with the family. So, do it the same way and save the money.