MERCURE PARIS BASTILLE MARAIS. . Mercure Paris Bastille Marais hotel: By car: From the ring road, take the Porte de Vincennes exit and follow signs to Place de la Nation and then Place de la République. On Boulevard Voltaire, Rue Richard Lenoir is on your left just before Place Léon Blum . By RER: Line A, Nation station, then take metro line 9 toward Pont de Sèvres to Voltaire station. By metro: Take line 9 toward Pont de Sèvres or Mairie de Montreuil to Voltaire station.