Sheshe, The Conwy Archives in Lloyd Street Llandudno have got something that may help with your research. The Street Indexes list the name of a person living at the property and that person is normally the breadwinner. It also lists their occupation.
The names of the occupiers are also listed alphabetically so it makes searching for someone relatively easy
The only thing is that the Archives only have the Street Indexes for 1911, 1914, 1922, 1925, 1929, 1939 and one other in the 1960's.
Is there any particular year that you are interested in?