It's a little ironic for a bar in Cape Town to be called Jo'burg - well, at least I think it's ironic. Anyway, reports have it that Jo'burg is one of the noisier bars at the top of Long Street - very vibey, and filled with a diverse group of young people who are out to party.
I've often seen the bar, but I can't say that I've ever felt the desire to visit. Noisy and cramped bars aren't my scene, you know. Well, that's me, but if you're visiting Cape Town and want to get a feel for the local bar scene, then this may be a place to start.
If you visit this area at night, take care - while the top part of Long Street is reasonably safe, this is a city... so keep an eye out, and avoid weirdos - okay? :)