The best place I stayed in Greater London until now at this price/night.
House is not easy to find, but... the owner is very helpful. He is explaining the route you need to take(= tube, which line, which end-station + local bus, number, busstop, end-station) very well and is waiting you at the busstop when you arrive. A little walk together to his house, and meanwhile he is telling you where you can find shops; places of interests; etc.
And then the cosy house! A very clean one! Nice room; good bathroom; towel; Wifi; coffee and tea and... honey(!). A kitchen you may use. You can even cook your own lunch and or dinner.
Providing you also a guide of the London attractions + a city-map. Super!
Also the DLR station 'Royal Albert' is just a short walk from the house. It brings you to the centre of London in an easy way.
I would say: "Be open- and positive-minded" and you will surely enjoy your stay at this 'guest'-house ;-). more