Puerto Madero has other locations in Mexico and the US, and I must admit that food quality and top notch service is consistent. A nice selection of wines from Argentina par their great steaks, fishes and pastas beautifully!
The only reason I put 'Very Good' instead of excellent is for flavor on their provoleta and carpaccio (much better at their Cancun and Miami locations). Other than that, a fantastic option in Masarik. Oh, and DO make reservations!