In Puerto Madero
Walking through the streets of Puerto Madero, all named after famous Argentinian women, you'll find this modern five-star hotel where, strangely enough, pets are allowed. It is one of the most beautiful and newest hotels in Buenos Aires. Although I only saw the outside, the building is stunning, with a 600 m2 foyer and 421 rooms. It is an old building that was converted into a hotel, and was opened to the public in March 2000.