Looking for a long-term exchange Barcelona - Berlin

Hello, community.

I am looking for a long term exchange Barcelona - Berlin. I plan to move to Berlin in July with my son Manuel (two and a half years old). I would like to have time to look for a flat there calmly, so I am looking for an exchange for at least six months, or a year in Berlin. Where we can also register. Our house is located in the neighbourhood of Sants, very well communicated, humble, but comfortable and has a big playground and a beautiful park just a couple of minutes away.

If any family or person is interested, we can exchange details privately.

Thank you very much!