Letter from Hermann Eduard Maertens to Wilhelm Kuppe, Bonn, May 1890 One year after Maertens' expert opinion, he reports on new findings concerning the house in a letter to Wilhelm Kuppe. He pleads for the rear building, as the Beethoven family home, to retain as much of its original substance and the impression of homeliness" as possible, while larger rooms with correspondingly advantageous museum presentation possibilities could be created in the originally separate front building facing the street".