I stayed with Trish for 2 weeks when I first moved to London, she was so accommodating and really made me feel welcome, she even provided me with bread, milk, fruit, eggs and butter when I arrived.
The room is ideal for a solo traveller, you have your own kitchen and bathroom with every thing you could need and is in such a central position - 3 minute walk to the tube and a bus stop at the end of the road. Highly recommend staying with Trish if you are after a self contained room with a great host! :)