- Kartnerring 10, Vienna I.
- Summer Year 1888: Gustav Mahler and Spiegler family: Nina Spiegler (Lipiner-Hoffmann) (1855-1937), Albert Spiegler (1856-1940), Clementine Lipiner-Spiegler (1864-1926). Meeting with Friedrich Fritz Lohr (1859-1924).
- 04-1897 (Year 1897): Gustav Mahler with Rosa Papier-Paumgartner (1858-1932).
- Ludwig Karpath (1866-1936) and Rosa Papier-Paumgartner (1858-1932) were both members of the Kegel club. They discussed with Gustav Mahler the possibilities for Gustav Mahler at the Vienna State Opera at Kuhrer.
- 11-11-1900 Supper Alma Mahler (1879-1964) and Max Burckhardt (1854-1912). Gustav Mahler was also at Hartmann.
- 18-03-1907 After the premiere of “Iphigenie in Aulis”: Gustav Mahler, Carl Julius Rudolf Moll (1861-1945), Max Burckhardt (1854-1912).
