I enjoyed my stay at Natalia's place. The top-floor apartment was small, but well thought out and furnished with everything you could want.
The location was in the heart of Recoleta and close to the subway. Within a two block radius, there are multiple grocery stores, green grocers, 24hr kiosks, and many great cafes and restaurants.
Her and her team were VERY quick to respond to any questions I had. Excellent hospitality.
One thing to be aware of: the windows/doors are not sound proofed. You will hear everything on the street. Being on the top floor next to the elevator engine, you will hear it hum (along with the fire alarm-like sound if you leave the elevator door open to long). These are loud, but after a night or two, you get used to it.
Overall, I'd recommend this for a solo traveller or couple who want to be central in the city.