La Cabrera is one of the best steakhouses I have ever eaten in. It's based in Palermo the posh area of BA, between Cabrera and Thames.
It serves up the best steaks and malbecs in Argentina and is reasonably priced but choose one steak dish for two as they bring you four steaks. It has some outside seating and is extremely safe.
Take a taxi there and from central it will cost you five pesos.
google La Cabrera or ask at your hotel
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