Werner Lewin, a pianist, lived at Wörther Str. 27 and at Stubbenkammerstr. 6, both in Berlin Prenzlauer Berg, prior to emigrating to Holland in the late 1930s.
If Bertje Härtz was indeed deported, she most probably must have survived, as there is no record of her at Yad Vashem.
(Gedenkbuch Berlins, Ausgemerzt: Das Lexikon der Juden in der Musik und seine mörderischen Folgen)