The Room Mate Carlos (part of the international Room Mate chain) is an upscale, 57-room hotel located among the skyscrapers and European-style buildings of the Buenos Aires Montserrat neighborhood. While the hotel's facade has a classic style, the inside transports guests to an ultra-modern, almost dreamy place: The lobby’s shades of green and quirky design create the feel of an underwater seaweed setting, and the breakfast area's decor is a bold abstract mix of patterns and sunburst light fixtures. Formerly apartments, the rooms are extremely spacious with high ceilings and two levels -- a lounge area, dining section, and small kitchenette on one floor, and sleeping quarters up a short staircase. The lofts are decorated in the same way as the rest of the hotel: clean, futuristic, and full of odd shapes and popping colors. Room Mate Carlos is located to the east of business-oriented Congreso, near government buildings.