I stayed with a friend in Room 2. The room was big, which was nice and the apartment is situated at approximately 30-40 minutes by bus/metro from the different landmarks in London.
There is a kitchen to about 4 rooms, so it can be a bit unpleasant to prepare your meals there. Also, the room got a bit chilly at night.
Still, a good deal if you are around for a couple of days in London.