I stayed solo at Thekla and Natalie's apartment for six nights in November.
I cannot stress enough how great it was. Communication with the hostesses is very easy and they promptly respond whenever you need any help. Thekla was waiting for me at the moment of checking-in, what a kind woman!
The apartment was very clean and welcoming. They provide all the toiletries and also the basics for breakfast (milk, bread, butter, coffee, tomatoes, cheese).
The location is great, right in front of the Company Gardens and the South African Museum. There are a lot of options of restaurants in the area. You can walk to the downtown area (15 min walk or a 3 USD Uber ride) or to the V&A Waterfront (30 min walk or 5 USD Uber ride).
It was great to sit at the balcony having a view of Table Mountain!
The building is also very secure.
The only downsides are the limited wifi (which is common in South Africa, though: even 5-star hotels either charge or offer limited data) and the bath without a fixed shower in a high position (might be a problem for people with mobility issues, since you'll probably have to shower stting down most of the time).
I definitely recommend staying at their apartment and will certainly book again the next time I go to Cape Town (by the way, great city!)