Fence height on neighboring property, fence on the property boundary?

Your right to have a say is irrelevant in this case, where both of you agree to decide together. I specifically do not see the municipality as another regulator sitting at the decision table in this case of the interim fence between you two. Legal question settled, now the factual question can be solved. And that is not really complicated: build a fence divided in height; in the lower part, which is not critical to your light, for example made of wood. In the upper part then made of plexiglass. A vehicle lettering company can wrap that for you so that it has high translucency while simultaneously being opaque (you probably know it from city buses covered over both ears), with the decorative motif "wooden fence." Problem solved, now I can watch Sportschau.

So you never go hunting for aesthetic points, do you?