Hi I have a few friends who live in Carnegie and it is entirely safe! There are rarely apex attacks and my mum who also lives there tells me that apex attacks in Carnegie are roughly the same as everywhere else in Melbourne :) hope that helped you a bit
I lived in camberwell and Carnegie very similar in ways camberwells got a lot of elite schools close by too. But overall at night in camberwell there were lots of fights outside players pools hall or even the train station and palace hotel great strip and nice Restraunts but to be honest Carnegie is much more safer you want walk alone and no problem at night.
Both Carnegie & Camberwell have lots for young kids, parks, library + transport & shopping for teens. Might want to research schools if settling permanently as many public high schools are zoned & private will have wait lists & differ considerably.
Carnegie has become quite a restaurant street but just up the road in Glenferrie Rd is a bit similar.