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
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.