Possibly electoral rolls ( staff may have "lived in"), but given the transitory nature of hotel work, and that many may not have qualified to be on the roll ( too young, or non UK), I think you will be very lucky to find much.
I was a police officer in that area in the 1980s and knew the Kensington Palace Hotel very well - it stood on the corner of De Vere Gardens and Kensington High St. Now gone sadly.