Nice older hotel, well located a few minutes’ walk from the Pimlico Tube station. The reception staff was always friendly and helpful, and I was pleasantly surprised by daily cleaning in my room. Many hotels in the US and France no longer offer this.
I suggest asking for a room on the back side of the hotel, as the road side can be fairly noisy. There was no thermostat in my room on the top floor and although the radiator was turned off, the room still got pretty hot. It cooled down quickly by opening the window, but then there was more street noise. Still, I had no trouble sleeping and the bed was quite comfortable.
Note that there is no elevator/lift in the hotel, so be prepared for stairs with smaller suitcases.