Pretty much that, you can be integrated in Berlin without speaking German nor interacting with german people

> The downside is, Berlin is not really integrated into Germany.

I'd kind of consider that a selling point. Berlin is cool and is different from the rest of the country. But I guess whatever floats your boat.

A similar thing is said about other European capitals: Paris, London, Amsterdam, Edinburgh etc. The inhabitants of these countries will say their capitals are not really like the rest of their country (or an accurate reflection of the country).

It's why so many people flock to large cities - you feel less like an 'outsider' because the population of these cities is so varied.

Not that it's a bad thing ;) (for the most part)

Well I come from NYC, so this is not exactly new to me. I suppose I'm the kind of person that belongs in a big city that's not really part of it's host nation.

Also, it is really not true that you can truly integrate, even in Berlin, without speaking German.