Mahler's Vienna "Headquarters" from 1909 to 1911.
Residence of the painter Carl Moll (1861-1945), whose second wife was Alma's mother, built 1906-1907 by Joseph Hoffmann (1870-1956, founder of the Wiener Werkstätten).
Today a private residence, not open to the public.
The 1st Carl Moll House on the map below was built in 1900-1901 by Joseph Hoffmann and was the home of the Moll family from 1902 to 1907. Alma lived here when she met Gustav Mahler.