The flat is located very close to cementerio de Recoleta and bars around. Lovely area really. The building has 24h security and the personnel is very kind and helpful. We had great communication with Mariana. We had no hot water on our arrival and contacted her, who responded and solved the issue quickly.
The flat is maybe a bit small for four people. Not a problem if you plan to spend the day touring around BsAs but might be a bit crowded if you wish to spend some time in the flat itself.
Other than that - I recommend this place. Hope to stay there again in our next visit to BsAs.