Go to Citadines Islington instead.
At the Hilton I booked a last minute room (a junior suite, the only room available) for a very high rate, and while the staff were all helpful, the room was pretty terrible. It was a large, single room with old contract carpeting very aged furniture and as for the "suite" elements, while the room was very large, it was largely empty except for two extra armchairs in a corner. Having stayed at the Citadines nearby, I can say that it is much refreshed, but with likely smaller rooms.