Hi NoX,
Another possibility is Betty's Bay - safe, not as great as Struis but a whole lot closer.
Main Beach is popular, Silversands beach some big spotties / the odd smooth hound come out often - good fun, and you never know - could pick up a kob or even steenie if you lucky.
If those areas are clean / the west wind is blowing you can try Maas Baai just past the Hangklip hotel.
And there are loads of rocky areas to scratch, although gallie season is closed then and the crayfish might drive you mad stealing your bait all the time.
And if you only have a few days / want to maximize your odds, perhaps consider making use of a guide? Wikus from MMM Cape Town Fishing Adventures has a very good reputation, and knows False Bay incredibly well - he would take you to the best place on the day / according to conditions and what you want to target. You can find him on Facebook.