Casa St. Angelo About Casa St. Angelo, the retreat center. The retreat center is a clean and simple center with dormitory style rooms. Most rooms are large and have single beds and private showers. A few rooms have two separate beds with shared showers. There are some larger family-sized rooms as well. Food is prepared by a local chef who sources ingredients from nearby farms. It's located in the tiny village of Sonogno in the Italian speaking part of Switzerland.