I stumbled across this city, Posadas, Argentina, while researching Paraguay. It's across the Parana River from what many consider the nicest city in Paraguay, Encarnacion. It's about 400,000. Has a very nice riverfront. Found a lot of nice Airbnb rentals in Posadas, all inclusive for less than $500 a month. Saw a rental with verified fast internet of over 200 mb's. Has an airport for cheap flights to Buenos Aires. What struck me is the many trees it has. Get into the residential areas and it's very shady.
Posadas is in the far northeastern province of Misiones. Most of Argentina was settled from immigrants arriving at Buenos Aires then venturing outward. Misiones is unique in that most immigrants arrived from southern Brazil. Germans, Italians, Spanish, Swiss, Swedes, Danes, and others. There's a city of 50,000 not far away called Obera that celebrates its European heritage every year with 15 European countries represented in its parade.
At any rate wanted to show you can live decently in this part of the world. Posadas has a couple of multiplex theaters and an Imax theater. Has some very nice supermarkets. Mild winters. The guy who made this video has videos of a bunch of Argentine cities.