Hilda was a fantastic host, and her place is lovely and cosy. It's in a great spot, right near the bustling liveliness of Brixton, and the room even looks out onto the beautiful Dulwich park. It's also about a 15 minute walk to Brixton station (on the Victoria line), which can take you into Central London in about 20 minutes.
We stayed for a month, and during this time Hilda consistently went out of her way to make sure that we felt welcome. I would definitely recommend Hilda's if you're looking for a place to stay in South London.