RARE. Facing Île Saint-Louis, in one of the most beautiful private mansions of the Marais — the Hôtel Nicolaï, built in the 17th century and recently the subject of a remarkable restoration — this stunning duplex apartment of 181.9 m² (145.3 m² under the Carrez Law) is located on the noble floor, accessible by elevator, and has been elegantly redesigned by architect Fabrizio Casiraghi. A place full of charm, with rare volumes (4.5 m ceiling height), bathed in light (Southwest - East exposure), offering unobstructed and pleasant views over the Seine, and complemented by a beautifully landscaped 20 m² terrace on the same level. The property is laid out as follows: - On the main level, the entrance leads to a vast reception room with grand proportions, featuring a corner living room that opens onto the terrace designed by landscape architect Louis Benech, a dining area, and a fully fitted and equipped open kitchen (La Cornue). This level also includes a bathroom with toilet and a mezzanine office (or guest bedroom). - On the lower level, a beautiful master suite with a spacious bathroom including bathtub, shower, and separate toilet, along with a custom-made walk-in closet. An exceptional apartment offering high-end features: refined renovation, premium materials, air conditioning, and two independent entrances. A cellar completes this outstanding property. Resident caretaker.