yes I will write to you for shure! That's super cool of you, and sounds like the winery is very well connected, 25km is not far;). pink wine sounds good haha!!!
berlin is always worth a trip, I was only once there (I live in Cologne, in the West, which I can also definitely recommend very much, generally the Ruhr and Rhein area has so much to offer, as you can also see in this post;). secret tips to berlin I actually do not have, but if you ever come to Cologne write me if you want. oh, I think corona has thwarted many plans... especially in the winter it was difficult... certainly it works out for you this year!