Cafe San Juan. late seating.
El Pobre Luis... it's not La Cabrera meat-wise, but it definitely has more of a futbol-loving portena onda. El Obrero could also fit the bill, or Guido's. The thing is for these last three, kind of a 'the more the merrier' scenario.
One of my recent faves is Sanbenito. It is certainly a bit on the elegant side but I wouldn't say pretentious. Could be nice to see Belgrano as well if he's only in town for 2 days, he may otherwise not...