We stayed at Aaron's place with 4 people and had a great trip. The apartment has everything you need, from power adapters to towels, which is really great, if you are traveling light.
The flat is pretty central, it is about 10 minutes to walk to the tower bridge and subway stations are close too. If we are in London again, we will definitely check Aaron's place first. There was even some sunday morning entertainment, when the neighborhood kids were playing football under the balcony.