*sigh* well that was fun. Just got off the phone with the hotel I'd booked, and they lost my reservation. I almost burst into tears. I leave on Thursday and I no longer had a hotel reservation. It's a damn good thing I made a point of calling ahead and asking before I just showed up and had nowhere to stay.
I ended up booking on points at a hotel chain (Holiday Inn Puerto Madero). It's not what I wanted where I wanted, but at this point I'm too upset to try risking another unknown entity. The Holiday Inn might not be as "real" Buenos Aires, but at least I know when I show up I'll have a room.