This will be only marginally helpful, but for what it's worth: My ex's sister-in-law is from Porto Alegre. I, being the idiot I am, never went there to visit. But from her husband's accounts, you do need to pick up at least some pidgin Portuguese to be able to shop and get around. And it is practically to the Antarctic circle -- travel from North America involves flying to one of the big cities there, then one if not two more hops to PA itself.
Quality of life, cost of living and value given, though, seem really good, from what I could tell at second hand.
And if bucolic countryside escapes hold any appeal, they are right at hand. Her siblings lived downtown while her parents ran a farm, dairy I think, some 40 miles inland in what her husband described as an unspoiled natural paradise.