El Barril de las Cortes

Address: Carrera de San Jerónimo, 17, Madrid. A quick check on the map can help confirm the entrance and the easiest approach.

Looks like they're open every day, so you don't need to worry about timing your visit around a closed day.

According to available data, this is a restaurant. Better suited to a more relaxed visit, a full meal, and a sit-down experience.

Accessibility appears to be limited. Entry may be possible only with assistance or with restrictions around access and movement inside, so it's best to confirm the details in advance.