Mitchell's Plain, Lavender Hill, Hanover Park, Bontehuwel, Heideveld, Elsies River, Kensington. Places you might drive through during the day with the windows up tight, but you'll soon learn where it is ok to go.
Lansdowne and areas like Southfield, Ottery are all mixed nowadays. You might get a really nice house, well kept garden, etc and next door is a run-down wood and iron shack. You won't get this in Pinelands, Bergvliet through Mowbray, any of the suburbs around Milnerton and Table View or the Atlantic coast. But of course you pay for this, houses are double the price
As the estate agents say, position position position.