Location is everything. Really. You choose this apartment if you want to be in the middle of it all. Short walk to almost everything you have decided to see in London. Many days you can spare the expense of travelcards and go everywhere by foot.
But that is also the caveat here. This is an apartment for people who want to use the apartment for sleeping - and spend the day (and night) out in London. It is really small. Sleeps four - no problem - but that is about it. The "kitchen" is a microwave, small refrigerator and a boiler. So no - you are not going to prepare a meal here. But that is not why you are here anyway. Right outside you have probably restaurants from all over the world.
And if you are a light sleeper - or just not used to noise from the street - you might also want to think twice about it. It gets really loud from time to time. So if noise is an issue remember earplugs - or choose a place further from the centre of everything. But, on the other hand, if you cant sleep there is plenty to do just outside the door :)
We were there with two 12-year old girls, and that was ok. Smaller children I would think twice.