Accessed through a tiny passageway in the Príncipe Real, an upscale residential neighborhood filled with colorful centuries-old mansions and tranquil gardens, this 41-room property feels akin to a secret hideaway—and a luxurious one at that. Embodying sleek, modern Lisbon, rooms all have floor-to-ceiling windows, and contemporary, inviting furnishings that include plush armchairs and soft faux fur throws in neutral white, gray and beige tones. Blond wooden slats separate sleeping areas from bathrooms stocked with Hermès toiletries. Other posh amenities include cocktail stations in each room, and in some rooms, a private balcony with outdoor fireplace. But the hotel’s most magnificent luxury of all might be its terrace, dominated by a long and narrow outdoor pool that’s heated all year long and fabulously lit up at night, perched on a hillside for sublime city views.