Agree with you guys esp about being drunk. I have quite often walked back from Tacuari near Constitucion at 2.30am after a milonga finished, never drunk or near it, and walked right up town through San Telmo and into (eventually) Corrientes. Never felt directly threatened though I cross the street if a group of guys is hanging around and I stay away from shadows. Even so, it looks like it may be wiser from what you say to take a cab from anywhere down near San Juan/Independencia up to town? San Juan is only subte I have ever come out of and seen two guys lining me up for a robbing, but as I was aware of them and walked right into the well-lit avenida and was clearly ready to defend myself they flaked away and turned in the opposite direction they had been walking. Even so, I would have liked to have taken them on.