Annie, My daughter (29) and I were in Cape Town last Dec. and absolutely loved it. We stayed in a hostel that was very centrally located to both town and Victoria Waterfront. We felt safe during the day but were advised to be very careful starting at about sunset and at night. Its an absolutely lovely city...very cosmopolitan, beautiful beaches, friendly people, very diverse culture, good restaurants, and alot to see and do...make sure you visit Table Mtn., there are several vinyards to visit as well. Another good tour is to go to the island where Mandella was incarcerated...there is a penguin colony on the island.
The hostel we stayed at was great...very clean, small pool, lots of friendly people, many also traveling alone so it would be easy to hook up with someone to tour with you and at a very reasonable rate.
Have a great time...I wish I would of had more time there...unfortunately we didn't have time for safari...the hostel can book any tours or safaris' for you.
Linda