While visiting the Plötzensee Memorial, I learned that the Hampels (the couple from the Alone in Berlin story) had lived in Wedding. So I decided to take the S Bahn and have a look. There's not much to see, but someone who lives in the building let me in the gate so I could get a closer look at the plaque. At least these people are being remembered in some small way.
"Here stands the house in which Otto and Elise Hampel lived from 1934 until their arrest. The working class couple was executed on 8 April 1943 in Berlin Plotzensee. Their resistance against the nazi regime was the basis for the book Alone in Berlin by Hans Fallada."