Daughters of Darkness (1971) on Netflix

Hungarian Countess Elizabeth Bathory didn't die in 1613 walled up in her castle. She is still alive over 350 years later and still preying on young girls for their blood. Elizabeth (Delphine Seyrig) and her secretary Ilona Harxzy (Andrea Rau) have arrived at a hotel in Ostend, Belgium. Concierge Pierre (Paul Esser) is astonished to see the Countess again. He last saw her 40 years ago when he was but a young bellboy, and she hasn't changed a bit. It is winter, and the only other hotel guests are a newlywed couple, Stefan (John Karlen) and Valerie (Danielle Ouimet) Chilton, who are en route from Switzerland to England, where Stefan's mother lives. Elizabeth comments to Ilona that Stefan and Valerie are perfect, and they take the adjoining suite. Stefan is having a hard time telling his mother about his marriage. He makes one excuse after another when pressed by Valerie, even going so far as to ask Pierre, in front of Valerie, to put through a call to his mother while slipping Pierre a note that says, "Say there is no reply." Stefan is not anxious to get back to England and finds reason to hang around Ostend for another day or two or three.