I had a great stay in Nina's place, and she is very helpful and forthcoming.
It is a big, airy and very cosy apartment in a vibrant neighborhood. It is near Ubahn station Rathaus Neukölln on the busy U7 line, which makes transportation easy. Also big multi-storey parking parks nearby.
Nina and her family made me feel welcome, and they were easygoing and kind, when my time of departure unfortunately got a bit delayed.