Hi Gabii,
I have been to CapeTown in 2002 during my university time and maybe some things have changed, but I really enjoyed the time in CapeTown. The pretty small inner city and the harbour area is worth seeing and also the table mountain should be climbed. The whole region to the south along the cost is really worth a trip, but also the vinelands to the east are attractive. Due to the rising criminality I would advise you not to do trips alone.
Have a nice day, Jürgen.