Location, location, location! Griselda's flat was as pictured and very comfortable. A couple blocks from the Obelisk and right next to subway (which you don't need as everything is walking distance). Building has two lifts and even a security guard on site. I felt very safe in the neighborhood which has hundreds of shops, restaurants, theaters, cafes and bars (most on pedestrian only streets). The free walking tour from the Obelisk which was very cool.
Griselda provided a multilingual handbook which explains everything including wifi login and password.
Tips: I got a Taxi to EZE airport at stand across form Obelisk for $400 ($28USD) and took 30 minutes with light traffic. You usually have to negotiate the price but I thought $400 was a great price and included $40 in tolls.
There is an ATM called "Link" about two blocks down Esmeralda and also found safe to use.
The tele gets a few English channels but if it doesn't come on try clicking the channel button up or down and then turn the tv off and on. It works but cable service is touchy. I didn't go to BA to watch TV.
Subway works great and can use Google Maps to find routes.
Starbucks and McDonalds in BA have good WIFi. Pull up your map or route and take a screenshot.
Highly recommended.