OK, let's start by saying that I was upgraded to an exec room, but I have to say it was a fantastic room by any standards, especially in London. Spacious, spotless, fantastically decorated, luxurious, huge bathroom with enormous walk-in shower; faultless.
Not cheap, but not in any way comparable with my experience of cheap hotels in London either.
Staff were very courteous and friendly.
Didn't use the restaurant, but breakfast was very good if a little pricey.
Wifi worked fine.
Location is very good; just a 2 minute walk from Westminster Abbey, Big Ben etc.