Maria was a fantastic host and very responsive anytime I needed to contact her. The apartment is beautiful and the bed is comfortable. Internet is fast (20mb) and the area is safe. Location is great if you want quick access to puerto madero. The apartment can get a little noisy with street traffic, the train, and potential protesters, but if you're used to city living then nothing out of the ordinary. The security guards in the building are not the friendliest I've encountered and they don't always allow deliveries to your door.
Overall, I'd recommend this apartment for its comfort and great host.