I was unable to access the website https://www.schoepfwerk.at to verify information about the Wohnbaugenossenschaft 'Heimstätte am Schöpfwerk'. The search results provided focus primarily on two municipal housing complexes in Vienna called "Am Schöpfwerk" - an older complex built between 1951-1957 with 866 apartments designed by Franz Schuster, and a newer complex constructed from 1976-1980 with 1,734 apartments designed by a team led by Viktor Hufnagl.
These housing estates were developed by the Municipality of Vienna as part of social housing programs, not by a housing cooperative (Wohnbaugenossenschaft) named 'Heimstätte am Schöpfwerk'. The complexes are located in Vienna's 12th district, Meidling, in the former suburb of Altmannsdorf, and together house approximately 5,800 residents.
The newer complex spans roughly 18 hectares and features a ring-organized layout with apartment blocks arranged around a central park. It includes community facilities such as schools, kindergartens, a youth center, library, shops, medical practices, and a pharmacy. The development incorporated principles from Vienna's "Red Vienna" era of the 1930s, aiming to provide affordable housing with modern amenities.
Without access to the specified website, I cannot provide accurate information about whether a housing cooperative by that name exists, its organizational structure, current projects, or scope of activities. Any portrait would require verification from the actual website content.