Having lived in Cape Town since 1996 I suppose I am reasonably qualified to give my opinion on the place.
Quite simply it's one of the most beautiful cities in the world. You have the sea the mountain, the wine estates, some great golf courses etc etc.
Unlike other parts of Africa you do get four seasons in Cape Town, although quite often on one day. It does have some of it's own little weather phenomena - during one approach the wind changed direction by 180 degrees within the space of a few hundred feet.
As for the people I think they're great but it's often said that they're cliquey & that people from Jo'burg are friendlier. Women are certainly much better than in the UK.
As for the crime - well by the grace of God I haven't been involved in any incidents. The thing is most of my friends have and the statistics don't make for good reading.