I spent 10 days at Tanja's apartment with a friend, for business + holiday. We both found it is just wonderful: very nice furniture, clean, good location in an area where it is safe to walk around even at night. Ten minutes walking from Mama Africa, one of our favourite bars and restaurants in Cape Town :)
1 minute from a supermarket open 24h, ideal for last minute needs.

We did not meet Tanja in person, but she has been very kind in providing lot of information, and offering also the trip from and to the airport. The house is well equipped, with everything one needs to cook (pots, oven, microwave etc), a stereo system that reads from Iphones,..

I loved the place and would totally recommend it for a stay in Cape Town. I would say ideal both for group of friends and for families