As the name suggests, this 1920s French-style hotel is fit for a duke—or even a president, as the mansion once served as an Argentine president's private residence. The hotel is a romantic option for couples, and its standout factor is its welcoming, friendly, and knowledgeable staff. They make sure the dining room's espresso machine is always at the ready and that baked goods are on display. The rooms are simple, though fresh and comfortable, done up in creamy whites and filled with elegant furnishings. For relaxation, there's an outdoor terrace with a pool.