All in all, a decent lounge at the Buenos Aires airport. This lounge is next to Gate 23 in…read more"Terminal C", after getting through security and immigration checkpoints. I put "Terminal C" in quotes because terminals A, B, and C are all seamlessly connected, with 23 gates total between them. So if you're at Gate 1 in "Terminal A", you can walk 10-15 minutes to Gate 23.
At the time of this writing, you can gain entry via Priority Pass and some sort of local American Express black card. There are American Express logos everywhere, so there's definitely a partnership here, but it's not officially a Centurion Lounge (that's about 7 gates down from this lounge, but it wasn't open when I was there, due to my absurdly early flight).
Aside from providing a toaster oven for the sliced bread and an espresso machine, it's all cold foods when I was there, but it was 5am, and there was a menu posted with 3 hot dishes for probably later in the day. That said, it's still moderately upscale, with a nice quinoa salad, pickled eggplant, tomato+mozzarella salad, charcuterie, 5+ types of whole fruit, trail mix, a bowl of peanuts, you get the idea... It may not be a hearty meal, but you can still construct a meal out of it. It good enough to be the little sister of a Centurion Lounge and befits the Amex brand.
Wifi was moderately fast and generally reliable for the couple of hours I was there. I also like that the lounge is open 24/7.
There's a beautiful children's play area that I found rather lovely. It was a nice touch. It was also enclosed on all sides, a subtle touch, but that means kids can scream behind a sound barrier, lol.
I didn't see a staffed bar, and I'm not much of an alcohol drinker, so I forgot to inspect what wine/beer options they had, alas.
Bathrooms: Clean and spacious. Generally well done.