Traveling to Cape Town for many years not and having stayed in various apartments (both AirBNB and not), we might have to readjust our definition of luxurious.
The apartment itself is very good. It is large with nice furniture and a well equipped kitchen. Staying there for a couple of days will probably be perfect. We have to mention the WiFi which - for Cape Town standards - is phenomenal! Tracey is a good host with fast communication and was very attentive to our needs and problems.
Otherwise, the place lagged behind some of our expectations. When the place is described as luxurious, one might expect a "view" (either the mountain or the harbor). We had some problems with the closet, which wasn't working properly and you might also expect a nicer backyard without looking at a "broken building across the backyard", etc. But that is of course an interpretation from our side. As we said above, the apartment itself is good and can be recommended. Just not as a "luxurious retreat".