Hi there,
Unfortunately more pubs have disappeared from Rhos than now exist in the village.
According to the B.B.C. (north east) Wales web site, in the section on Rhos, there is no mention pub, either present or past, in Penry Street. However, that is based on personal memory of the author and may not go back to the time you are looking at; which is, by the way?.
I would have thought that if 8 Penry Street was a pub then it would have been named on the certificate as such.
Good luck with the research
