I stayed at Helen's place for roughly 2 weeks and it was a wonderful experience. Helen's air bnb is located at a quiet/safe neighborhood. There is a grocery store just around the corner and it is within 10-15 minute walk to the nearest train station. On the day of arrival, I had to check in late due to traffic and Helen was very understanding. Helen is one of the best air bnb hosts I ever had and I would definitely stay at her place again if I ever visit London again!