Let the street settle around you for a moment: this is Capela de Fradelos. The practical detail to keep in mind is its visiting timetable. From Monday through Friday, the chapel is open from 07:30 until 12:00, then again from 17:00 until 19:00.
On Saturday, the opening period is 09:30 to 12:00; on Sunday, it is 10:00 to 12:00. If you have arrived outside those times, this is still a useful place to mark in your plans rather than a door to test repeatedly. Take a moment here on the sidewalk, keep clear of entrances and passing pedestrians, and note the name for a return visit during an open period.
Capela de Fradelos has no legal heritage protection. That makes the schedule especially helpful: it gives you the clearest practical way to plan a closer visit, whether you are fitting it into a weekday morning, an early evening, or the shorter weekend hours.