Very good value for money considering that most Airbnb accommodations in London are over 100€/night. This one was significantly cheaper and the room has a private bathroom. It also has a fridge and TV (although we didn't use it). The owners were very nice and we checked in late on the first day, after 10pm.
It is not exactly in the center of London, but it takes 25 minutes to get to the center by bus.