The president of Argentina does not live in the Pink House. In fact, she's hardly ever there.
This building is located at 50 Balcarce street and Paseo Colón. On the left side of the building there's the subway station called "Plaza de Mayo" (line A)
The name of the station is after the park located in front of the Pink House.
You can see this park in old films of Evita Peron's speeches, as this is where the people use to gather to face the balcony from which she used to speak.
Plaza de Mayo is the oldest park in Buenos Aires. Its name refers to the month in which the people of Buenos Aires gathered to ask for their viceroy's expulsion of the territory and so become a free country.
This was on 25th May 1810 in this very same spot.
Since then, this park has become "the place in wich the population as a whole has a voice".
This is why this is the place in which people gathered to see Evita and even asked her to become vice-president.
This park was also used by relatives of people who had dissapeared under the militar regime in the 70's, to demand for information. This people wore a characteristic white headscarf.
At the center of the park there's a 20 meter tall white needle created for the 100 anniversary of Argentina.
All around this monument, on the floor, you can see drawings of their scarfs, in commemoration to their struggle.