Remember, you're not in the U.S.
In evaluating a hotel "across the pond," it's important to recognize that U.S. hotel standards are not the norm in the world. By U.S. standards, the Kensington Hilton is just okay; small (pricey) rooms, minimal closet space, and chilly. I was there in February couldn't seem to get the room to warm enough in the evening (but hey, it's Britain, they're used to wearing woolies all the time). Also, it was noisy; lots of conversation along with doors opening and closing as people came back to their rooms late at night (again, this is Europe), and I could hear the closets next door opening and closing as the neighboring guests prepared to depart in the morning.
Pluses: The hotel has ice machines (which is not the norm over there, and which was most welcome to this ice-loving American) and there was a bus stop right outside the door; very handy. The conscierge had all the maps I needed (the bus routes, the tube routes, and most of the main sights I wanted to visit) and was most accomodating about helping direct me to sites I wanted to visit as well as determine the best way to get there. There is also a pickup for "The Big Red Bus," one of the better double-decker tour buses; but be aware that the tour does not drop off at the hotel in the evening! The beds at the Kensington Hilton were generally comfortable and firm (no feather pillows, however) and the morning beverage station was far better than most; real creamer (the kind in little cups) and plenty of packets of coffee, quite decent teabags and even artificial sweetener. This was most welcome as few British B&B's or hotels provide anything but sugar.
In closing, it was a nice place to stay, but nothing to write home about. I would certainly not be opposed to staying there again, finances permitting, but the adventurer in me will probably try a different venue in a different part of town next visit.