Nombulelo is a fantastic host. You can't feel more welcome. I can highly recommend to stay with her. Don't be afraid of going to Langa, no matter how many people might warn you. As long as you don't walk the streets just by yourself without knowing the area (and it's easy to find company) you'll be perfectly fine.
Just catch an Uber to Nombulelo's and find out for yourself what Langa is like.
And don't miss out on Nombulelo's food as she is a brilliant chef.