It joins PlaÃ a Espanya , in the Sants-Montju Ã c district of Barcelona with the metropolitan area cities of L'Hospitalet de Llobregat , CornellÃ de Llobregat and Sant Boi . It joins PlaÃ a Espanya , in the Sants-Montju Ã c district of Barcelona with metropolitan area municipalities of L'Hospitalet de Llobregat , CornellÃ de Llobregat and Sant Boi .