http://newspapers.library.wales/search?range%5Bmin%5D=1804&range%5Bmax%5D=1919&query=%22caerau+arms%22&page=1Hi
I have found the Caerau Arms on the 1901 census. The head of the household is Francis C Sage (RG13/4970/113) who is down as a cab proprietor.
On the previous page/image, the addreses are 1 - 6 Cowbridge Road, then on the page for the Caerau Arms, the houses continue as 9 - 17 Saintwell (Cyntwell) the next page is 18 - 24 Cowbridge Road. I suspect this doesnt confirm the link sent earlier as being the same '8 Cowbridge Road', as street numbers may have changed over the years if properties have been demolished ??
If you then search for Caerau Arms in the Welsh Newspapers Online (put your search in as "Caerau Arms")
In particular, one page three of the results, there is an article of 1st June 1885 that talks about an individual walking with someone who lived at Culverhouse Farm when someone jumped out of the hedge near the Caerau Arms
hope this helps pinpoint the premises
Mar