You can't say that. It is impossible. Every nice area has a Barrio on the next street. You need to follow your finances in the Capital, that will direct you better than anything. Zona Universitaria is super safe, probably got more security than any other area of the city, but is expensive and has little else other than that. Nothing has it all, it is a very very dense city. Sh1t, gold, bentleys, bangers, whores, pops stars, *****restaurants, street vendor dog burgers, police, paedo's, drugs and hospitals will all be on your doorstep more or less , where ever you live. You just have to take the best of what is important to you and live amongst the crap that isn't.