About the appartment: it is on the Santa Fe Avenue directly opposite the entrance of the botanical garden. It's on the 7th floor (by elevator) and it has a balcony with a beautiful view over the large botanical garden. Closeby (20 meters to the right when you leave the appartment) is a good bakery and 200 meters to the right is a very large supermarket (Coto). The Palermo district is a nice district to stay in. It has many restaurants (also for vegetarians) and street art to be seen. In the appartment is airconditioning in the living room/kitchen and a second unit in the separate bedroom (with the balcony). In the bathroom is a washing machine.
About the host: she is very helpfull. She was already waiting for us when we arrived from the airport. We arrived in the early morning on the airport (06.30) and because there where no guests in the night before she allowed us to get into the appartment when we arrived in the city at 09.00. That was great because we were very tired after our 14 hour flight from Europe.
More information (from January 2018): airport Ezeiza/Pistarini has free Wifi, good exchange rates (22,95 pesos for 1 euro), taxi to the appartment was 30 euro (35 Us dollar) and took 45 minutes. I what's apped Maria when I got into the taxi so I could tell her that I would be at the appartment about 45 minutes later.
Must see in Buenos Aires: the el Ateneo bookshop on 1860 Santa Fe Avenue (it's located in a former theater and the stage is now a coffeebar). Best day in Buenos Aires: Sunday (many streetmarkets, tango on the street in San Telmo and La Boca. Little warning: if you go to la Boca you will see restaurants with tables on the street where you see Tango dancers. The prices are high. I paid 10 euro (12 dollar) for a plate of french fries and 8 euro for a glass of white house wine. They also charge 15 % extra for service and 10 % for taxes.
Have a nice stay in Buenos Aires!