I really loved Andrea's place. It's in the middle of the action, but on a high enough floor that it's quiet, and you can actually sleep. I used to live on this street, and believe me, this is a big deal.
There is also a 24 hour doorman, a huge plus in Buenos Aires, which can be a little dangerous.
It's full of light, very comfortable, great patio for breakfast. The actual apartment is pretty small, but great for 2 people. I'd highly recommend it. Andrea even left us some provisions in the fridge, which I consider way above and beyond.
For anyone that wants to be in Palermo, it would be hard to find a better place. I would definitely stay again.