The Hotel Único isn’t fooling around. For all the pops of color and geometric modern sculptures scattered throughout, the cutting-edge technology in rooms, extensive book and DVD library, and whimsical cocktails and creative takes on Spanish classics, this stately 19th-century townhouse in Madrid’s ritzy Salamanca neighborhood is one of the city’s most grown-up hotels. It would have to be, to be home to a two-Michelin-starred restaurant that’s regularly hailed as the city’s best. And each high-ceilinged, wood-floored room and suite—decorated in celebrated designer Pau Guardans’ black-and-white take on Mad Men—shouts sultry rendezvous rather than drop-and-go crash pad. A haven in the bustling capital, the serene manicured gardens with mesmerizing Spanish guitar performances by evening aren’t meant to be traversed by screaming children, nor are the living room–like library and free treat–stocked lounge intended for raucous parties—which would explain why they’re open to guests only, so you can sip scotch and lounge well into the wee hours. So, no, the Hotel Único isn’t fooling around, but it sure knows how to have a good time.