The Onyx is located directly across from the Convention Centre and a short Uber ride from the waterfront. Bo Kaap is walkable too.
The apartment was clean and well appointed and we were very happy there. We had a problem with our key fob and a broken iron, but Koos was very responsive and these were sorted out very quickly with no inconvenience. The balcony provides a view of Table Mountain for your morning coffee and there are good restaurants for breakfast/lunch (MRKT) and dinner (Yu) on the ground floor of the building. We would highly recommend this apartment!