Concierge.com's insider take:

The spirit of Argentine dance legend Carlos Gardel presides over this "Residential Tango Academy," lovingly crafted by artist Héctor Villalba from a 1903 Italianate mansion in San Telmo. This is tango—combined with five-star service—to the max: Multiday packages feature hands-on tutelage from visiting maestros, and the Wednesday-night milonga (tango party) has become a choice destination for aficionados from around the city and the globe. But the Dandi is also ideal for just putting your feet up: The various lobbies and rooms—including the stand-out Astor Piazzolla suite—are outfitted with overstuffed chesterfields and finished off with murals depicting scenes from the handlebar-mustache era. For budding tangueros looking to replenish after a day of windmilling around one of Dandi's deluxe ballrooms, there's a roof-deck pool and the inviting Patio Andaluz, an enclosed courtyard that's perfect for late-night cocktails or a boisterous asado (barbecue).