Recommend the Sierras of Tandil, 5 hours from Capital.
Decent internet, and reliable WiFi in the many bars and cafes here.... its the mini silicon valley of Argentina...more than 40 IT companies here.
Plus you will most likely meet people, as there are few, if any, foreigners. Have yet to meet another Englishman in two years living here, which cannot be a bad thing.
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Going to take a look! Thanks.
Rio seems like its also pretty hot and humid.