Great! I had no idea about this.

Buenos Aires is not a good place for any starseeing. Beyond the buildings and lack of room for watching anything, the city's lights (public lighting, houses, etc.) cancel any possibility of seeing an eclipse in the night. Also BA skies tend to have a pollution layer (especially in the winter) that blocks the stars a bit.

I just googled a bit and found this good map by NASA: https://eclipse.gsfc.nasa.gov/SEgoog...02Tgoogle.html

In the BA area, Lobos and Chascomús are right on the eclipse's central line. Both are 100/150km from the city and have good accommodation. Ranchos is also on the line but it's a very small city - there's probably a hotel or two catering viajantes de comercio and that's about it.

Outwith BA, the eclipse will go through the emptiness of Cuyo's desert and the Pampas. San Juan, Venado Tuerto (Santa Fe) and Merlo (San Luis) are the only "large" cities on its path.