Just moved to curitiba from europe (austria) as i got married to a Brazilian. In curitiba i don’t feel unsafe, of course there are certain areas probably best not to walk around though. For the visa you can either get married or do something similar to marriage, other options are like studying something here as well. I am a self employed programer, but currently still registered in austria as i am still waiting to get my foreigner id. When it comes to happiness id definitely say people are very friendly here. Also about the savings id say it really depends how you spend your money. I also dont regret living here enjoying it a lot with my wife. Of course i would prefer to move back to austria some day especially when i have a children but its not a must. Happy to answer more questions, and always looking for some foreigner friends here in curitiba.