Any hints at all, a teacher's name than might be in the 1901 Census perhaps, on the old map of Waterford City I can see at least 19 National Schools
This didn't come up on the Historic Layer but I assume Sch stands for school, right next to St Patrick's church.http://maps.osi.ie/publicviewer/#V2,660552,612534,12,9
I think this is it on the Censushttp://www.census.nationalarchives.ie/reels/nai003496355/Can't quite make out what it saysAnd 1901http://www.census.nationalarchives.ie/reels/nai001231935/