Youkali, Estados Unidos at San José
Don't really know if this is the perfect monger's hotel, but it's a fun little number. It's a turn-of-last-century mansion cum five-room hotel in Montserrat, across 9 de Julio from San Telmo and a five-minute cab ride from Plaza de Mayo. The beds creak so it's probably not that cool if you're planning to have chicas in, but if you're just looking for a cool place to stay, it's a got terrific atmosphere and character. Anyway, just thought I'd let you know about one off the beaten track. Rooms were USD 50-60 a night last time I checked.
EC