Charles Dickens lived here with his family, 1839-51. They had moved here from 48 Doughty Street. The ninth child Dora, was born here and died here in 1851 aged just 8 months. Her mother Catherine was recuperating away from home so Charles had to write to her. But rather than announce the death he wrote " ... I think her "very" ill. There is nothing in her appearance but perfect rest. You would suppose her quietly asleep. ..." Wikipedia has the full letter - it is very touching.
Both parents were very affected by the death and we've read that it was this that meant, when the lease ran out at at Devonshire Terrace, they were keen to move elsewhere. Tavistock House was their next home.
A drawing of the house at the Victorian Web looks as if it has a plaque.
This 1893 map shows the house on the west side of Marylebone High Street, half-way between Marylebone Road and Marylebone Gardens, apparently with a large garden stretching to Marylebone Road.
Demolished late 1950s.