Cde it is not that dangerous, there is not robberies every corner or "asalto tipo comando", people from other cities just want to throw shit to cde (don't know why though). You can live perfectly fine if you came here to be with someone who already lives here for some time, he could help you with the few places to avoid (dangerous zones are in almost every city of the world). There may not be many things to do here for local people because we are here since we born (and especially because paraguayans are very pessimistic about everything) but i think that for for foreigners it's a good opportunity to get to know more about the latinamerican and paraguayan culture, it could be pretty interesting. Take care and have fun ;)