The Friesenkeller is located just across the canal on the side of the Hambug City Hall. You get there by walking to the end of the bridge and then walk down the stone-stairs.
The room is open but still cosy as it is oozes of German "Gemütlichkeit" - the German way of having a good time.
Try the Friesenteller - mix of turkey and steak with pan-roasted potatoes and sauce bernaise. You will NOT leave hungry.
Another good hint is the potato soup - chunky the good way.
And prices...... The level is really low compared to Danish prices, so I was satisfied. ;o)