We loved our stay in Fiona's studio. She was a very sweet and understanding host.
The apartment was clean and had great wifi, fast enough to have a video Skype session with work colleagues in the US. There is great storage and lots of space.
The kitchen had everything we needed, and the shower was wonderful (brief showers only - given the drought in CT).
The outside area was sunny and we saw many interesting birds, flowers and butterflies in the garden. We even saw the owl (of 'Owls View') on a lamp post down the street!
We spent more time exploring the region than in the apartment, and we'd strongly recommend renting a car to get the most from your trip. The place has a small parking spot (off-road but not behind a gate - so we didn't leave anything in the car but we didn't feel it was risky to leave the car there).
In short, it's an excellent, great value place to be based as you explore Cape Town and the peninsula.