Agustina was an excellent host! I arrived at the apartment at 9AM in the morning and she made herself available and came right on over to allow me an early check-in. She showed me around the apartment and answered all questions. She also offered me some excellent suggestions on places to go, great restaurants in the area, and good spots for bebidas. She made herself available over WhatsApp. Never had to wait more than a few minutes to get a response from her. My flight out of BsAs was a very late night flight and she allowed me a late checkout as well.
Regarding the location of Agustina's apartment. I like to live in a place which has close accessibility to supermarkets and her place does not disappoint at all...there are 4 supermarkets, including a very large Coto on the next block parallel to her street (5 min walk), a Vea store on Bulnes about 4 blocks down (~10 min walk), and a few general Chino grocery stores within a 2 min walk, so you are covered all the way. The apartment is just 2 blocks away from Cordoba, 1 block away from Honduras, where there are some nice little shops, stores, and restaurants. I've never been a huge fan of ice cream, but even i checked out "Nicolo" on the corner of Bulnes and Honduras a few minutes walk from the apartment. There is usually a line outside the booth, but that's because it's quality gelato and the best deal in town at 40 pesos for 1/4 kg.
As for mass transit, the metro/subte' is about a 15 min walk. I always took the B line at Medrano, but i believe the D line is about the same distance in the opposite direction from the apartment. Make sure to get yourself a Sube card so you can recharge it. There are plenty of buses close to the apartment on Cordoba.
Agustina's apartment is an excellent value in a great area, which is quite quiet and residential, but that has a lot of lively places very close. The walk to all the hip places in Palermo Soho is a simple walk from the apartment and takes no more than 20 mins or so to get to. One of Agustina's recommendations for a lounge to check out with excellent drinks/mixology is Rey de Copas. Highly recommended!
I rate Agustina and my stay at her apartment an A. Highly recommended!