Personally, Renown Park has felt like the most unsafe neighbourhood I’ve lived in, but it depends exactly where in Renown Park you live. Some areas are primarily government housing and you can literally see needles on the footpath. We get quarterly Crime Stoppers newsletters delivered for the area and they’re always filled with small thefts (generally people taking things from sheds or backyards). I’ve come home twice in the last year to see part of my street blocked off by police to resolve “disputes”.
It’s a relatively cheap suburb for how close it is to the city, but that’s for a reason. If safety is a key concern, I really can’t recommend Renown Park at the moment (2019).