I can only recommend Bronte's apartment. I have lived in Cape Town several times for extended periods and can only recommend the area. Everything (e.g., beaches, southern suburbs, hiking trails) can be reached in about 10 minutes and the immediate area offers many, very good restaurants and cafes which can be reached safely on foot. The area is safe and I would always prefer it to areas like Sea Point.
The apartment itself is home-furnished and probably not a typical Airbnb. I liked that - it made me feel right at home during my long stay. The view of the city and Table Mountain from the living room is incredible both day and night. The neighbors are very quiet. At night you have no street noise at all.
Not only the apartment but also Bronte is an absolute gem! Super friendly, very responsive, and always ready to help. I can only recommend the apartment and the host for both short and long stays.