I had looked in there, Hugo, but no clues as to the address, could not see anything in the alphabetical indexes either, although there are plenty of E and W Owens' !
The references to roads "off" Church walks are Promenade, Mostyn Street, Tudno Street, Old Road, Abbey Road, Bodlondeb Hill, and Ty Gwyn Road.
Ty Gwyn Road has several integral terraces, such as Llican Terrace, Belle Vue Terrace and Tan yr Ogo.
Have you tried the 1911 census? I can have a look if you don't have access