We had an amazing stay in Buenos Aires!
The photos match exactly what you can expect, and I think the place was actually bigger than it seems, it's perfect for a couple staying for several days. The location is also excellent, as it's not far from the subway nor the nice restaurants, there's a pharmacy closeby and a kiosko on the corner that stays open all night long, and a supermarket just in front of the building. The street as you may think is a little busy, but the windows are AMAZING, you can hardly hear a thing with them closed.
We didn't use the AC, but we used the fan mode and it was enough to sleep comfortably when it was around 25C I think, so I guess the AC has a lot of power even during the hottest days. The curtain on the bath wasn't a problem as there is two of them, so we just keep one inside of the tub and didn't have problems. Overall, we had an amazing experience and we're looking forward to come back!