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You'll find a similar thread here.
Many expats live in gated communities, but if you want to avoid those you could try areas like Parkhurst or Emmarentia which both have an up-and-coming cafe culture but are very green, scenic areas. There's also Rosebank, which is a bit more centrally located, close to the Rosebank Mall and Sandton. Most houses and flats in these areas will have decent security systems like burglar bars and alarms, etc and are comparatively safe areas.
Check out the Accommodation in Johannesburg and Areas and Suburbs in Johannesburg pages for more information.
Regarding the visa/permits: tourists from certain countries can only stay for a maximum of 3 months without a visa, so you will need to apply for a temporary residence visa. These are aimed at visitors who plan to stay for between 3 months and three years. However, there are a variety of these - I'm not sure which one you fall under, to be honest! There's a list of types of temporary visas and permits here: http://www.southafrica-newyork.net/homeaffairs/trp.htm
I suggest contacting a consultant firm like Immigration South Africa to ask about your options.