Argentinian here, I built my house about 10 years ago with a fixed rate mortgage subsidized by the government. It was subsidized only for people that didn't own a house already. It was a 16 years mortgage. First year I paid about the same as someone renting a house. Past year I was paying about only 10 dollars per month, so I cancelled it :)

But yeah, as far as I know, at the moment there are no fixed rate mortgages.