There are no armed gangs in Luanda.
Its what you make of it, not a clean place for sure but lots of resturants and Miami Beach is great for a Sundowner.
Keep your nose clean and do your job and put the cash in the bank and go home.
Some guys love it and get a local girlfriend and learn Portugese and relax, calma calma.
Its Africa mon not for all but better than some camp in the desert with no cool ones if yo uknow what I mean.
Angola is booming, have a go at it.