I live in Braunschweig myself, but you can check rent prices for Berlin for example here: https://www.immowelt.de/immobilienpreise/berlin/mietspiegel so now probably about 12€/m² - obviously more expensive in better locations. What I heard from friends the market in Berlin is a bit difficult so really get that relocation service if you plan on moving to Berlin. Those prices typically include tax. Salary numbers on the other hand are before tax. You can roughly estimate your income tax with simple online tools: https://www.brutto-netto-rechner.info/ (ya hablas aleman?) It's way higher than e.g. USA, probably similiar to Argentina.

I think i spend about one week near Cordoba in 2004 but I don't quite remember... My guest family back then lived in Ushuaia (very very beautiful landscape!) where I spend most of the time, but also a while with their extended family in Rosario. Last year I revisited Ushuaia again but spend most of the time in Tigre where my guest family lives now.

Feel free to contact me by pm or mail (kiney at-sign kiney.de)