Our family of 5 had a fantastic longer stay of 10 days.
The unit doesn't have a safe outdoor space for toddlers - one side has the splash pool, and the grass section is an access pathway to the street (blocked by a locked gate, but I found myself continuously checking that everyone had closed it properly). But the indoor areas were easy to baby-proof and keep clean. The main bedroom is huge, and accommodates the camper cot easily.
The kitchen is well equipped for when you are tired of takeaways, and the WiFi kept the teens busy and in touch with their friends during bad weather.
Milner place is perfectly located - local attractions (Cable car, Signal hill, Company gardens, Greenpoint stadium and park, Seapoint Pavillion, Waterfront, Aquarium) are all 10 minutes by car, and if you travel anywhere you are generally going against the traffic.
Contact-less check-in and check-out worked effortlessly, and Anton was always available on Whatsapp.
We had a great stay, and hope to see Cape Town again soon!