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As someone who lives near the Northern tip of Grunewald, I much prefer the ride out to Wannsee. Can do it almost entirely off road through the length of the forest (lots of different tracks and paths), cycle on the bike lane on the edge of the forest, or go along the Havel. All routes are nice. Havel route can get a bit congested on sunny weekends.
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I can recommend this book. We used it for Lützi and it worked incredibly well. Like @ltc says, there needs to be consistency between the people training/living with the dog. Obviously you need a lot of patience and will power (so does the dog).
We have used a Tojiro DP Nakiri for the last 5 or so years. Haven't sharpened it once (except honing steel) and it still cuts like a dream. I've sharpened other knives 20+ times in that timespan (decent quality knives, to a razor edge) and I have to keep re-sharpening them after a month or so. This knife keeps an incredible edge.