Alison's place is located in a very central area: in ten minutes of walking you can easily get to the attractions of Westminster; furthermore, it is absolutely well connected by tube to the other places of interest in London, most of which I've also reached on foot.
The bedroom is really confortable for two people: it's got all you can need and it's very clean, as the bathroom (and this was an issue of primary importance to me).
The only inconvenience was that the area is a bit isolated, specially by night.