I was in the Conwy Archives so I thought that I'd have a look at the Llandudno Street Indexes for Friar Dale.
The 1939 index listed all the houses and Friar Dale was No3 Augusta Street in that year and the breadwinner was Thos R Finnigan.
No6 was actually called Abergevenny House
In the Street Indexes for later years there must have been some renumbering as Friar Dale was then No6.
The house was the 3rd one on the South West side as you go from Albert Street and I double checked it before I took the photo as all the names have changed in the intervening years. In the photo it is the building to the right of the red bin.
Mostyn Estates owns the property along with No's 2 and 1 and the maintenance man for the Estate was there when I was looking at the building.