I had the great pleasure of making this trip. Two things to share:
Argentina is a country where nature is amazing, contrasting: tropical in the north with the Iguazu Falls which are a wonder of nature, in the south, we find the steppe of Patagonia with its breathtaking glaciers and authentic estancias.
Argentines are very welcoming.
And also, taste the parillas: delicious grilled meats that are a must!
And the organisation?
At the top'! Punctual taxis and buses, friendly French-speaking guides, perfect hotels.
Words are useless, only experience counts: don't hesitate to go there!