Helen's house is on a 12-15-minute walk from Clapham South Underground station in South London (there is also a bus station in front of her house with a direct connection to the Tube). The room is very convenient, the bed was very comfortable, the wi-fi connection was also great. The room is on the 2nd floor with private bathroom for the guest.
Helen is a lovely person and very friendly. She even welcomed me with a nice cup of tea when I checked-in and she was extremely helpful during my whole stay within her house. On the same time Helen respects her guest's privacy and I really appreciate that.
The only negative on her house is that it's situated on a noisy street, but I didn't have any problems with my sleep.
Overall, I am very satisfied with my stay in Helen's house.