I was a neighbor of Freud's former house. I used to live at Berggasse 27. Freud lived at nr. 19. It is now the Freud Museum. The Wohnungsanzeiger linked by Alexander Burstein's comment says that Max Gans-Schiller lived at Porzellang. 16, which was around the corner and down the street (Porzellangasse) from Freud's building, and that he was a businessman dealing in modern office goods or furnishings. You can see a picture of Porzellangasse 16 on Google Maps.
