Coppelius Station was the place on the planet Coppelius where Doctor Bruce Maddox and Altan Inigo Soong secretly created a new community of organic synths, after the Federation banned synthetic lifeforms in 2385. Soji Asha and all her "brothers" and "sisters" were born there.
In 2399, Soji led Jean-Luc Picard, Raffi Musiker, Cristóbal Rios, and Agnes Jurati to Coppelius Station. Musiker nicknamed it "Synthville". (PIC: "Et in Arcadia Ego, Part 1", "Et in Arcadia Ego, Part 2")
According to background materials, the Coppelius house was filmed in August 2019 at Imagika in Malibu, California. Set decorator Lisa Alkofer described rendering the location, which made heavy use of creams and golden-orange hues: "Because La Sirena is so dark, and the Borg Cube so dark, we wanted to embrace that lightness, to bring all the light in..."