In the 1969 Directory it is listed as Castleton Private Hotel Gloddaeth Avenue in the Trades Section and in the Street section, the listing is in the name of Ronald G. Line. The property is not numbered, but its nearest neighbours are Llwyn on one side and on the other side Awelon, which I think places it at the West Shore end as there is a house named Castleton there which can be seen on Streetview