Location is the king here, so it's the space itself - exactly as seen on the images. Great for families. Normally, not having twin beds may be the issue for families with two kids of the different age. Not here. We simply occupied 3 rooms, being in 4 we have used two bedrooms and living room to sleep.
Back to location - Natural History, Science Museum, Big Ben, London Eye, Battersea Power Station, Chelsea stadium - all in walking distance (under 40 minutes), not to mention vast choice of restaurants in the nearby area (under 15 minutes) - you don't want to take tube to go to restaurant, right?