55 Warwick Gardens, Kensington, London is the house where my father, H.E.M Newman, was born, and an account of his early life there can be found in his Reminiscences.
His parents lived in Warwick Gardens for no more than 10 years before moving out to the "Metroland" suburb of Northwood in 1908.
The Google Street image of Warwick Gardens (below) doesn't clearly show No 55 but No 61 can be seen on the right, and No 43 is further down on the right, so No 55 should also be on the right hand side somewhere behind the trees.
The map below shows the location of the Google street photo above. Below that is a smaller-scale map showing its general location.