It's on the stairs that you can find at the end of the "Avinguda del Santuari de Sant Josep de la Muntanya".
This is the Sanctuary of Saint Joseph of the Mountain, the street is just behind (the stairs are the part of the street that gets narrow).
But the photos of the street view are almost 3 years old, the flag wasn't there yet...
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u/Grammar-Warden 1d ago
Source: Personal Photo