We had a great stay in Bo Kaap! The location is right at the heart of the neighborhood, with several great restaurants and shops at the doorstep.
Brian and Lulu have done a fantastic job making the apartment homey and liveable, down to the small touches—kitchen knives are sharp! Bath towels are large!
There's a fair amount of noise that bleeds in from the street and the apartment above, but inside feels quite peaceful. We were working during our time in Cape Town, and the wifi was decent (35 mbps down, 9 mbps up) aside from times when load-shedding was happening. (The apartment doesn't have a back-up, so if you plan to work it's best to use a co-working space nearby.)