Karin is selling her late father's single-family home in Potsdam-Babelsberg — built 1968, 142 m², garden with an old apple tree, double garage, asking €495,000. She has no energy for fourteen weeks of open houses. She uploads the title deed, energy certificate class D, chimney-sweep protocol and 47 photos to the AI Property Twin. One hour of training on plans, protocols and neighbourhood data — the Twin goes live Saturday at noon.
Saturday evening they browse. They put 89 questions to the Twin over the weekend: roof age (12 years), septic or mains sewage (municipal since 2011), fence-line agreement with the neighbour (registered in the deed), distance to Grundschule Babelsberg (480 m). The Twin answers while Karin sleeps.
Monday viewing at 10:30, Stefan and Antje stand under the apple tree. Offer Monday evening at €482,000, Karin accepts Tuesday. Notary date three weeks out. Classical agent commission of 3.57 % would have been €17,300 — saved. Eleven days from upload to acceptance, the Twin answered 89 questions while Karin grieved.
