https://www.openstreetmap.org/way/890224243/history
There does not seem to be a sign for housenumber 3 on Mapillary for this building. Is it on the shop entrance, signs, or cards?
You could alternatively ask the staff and add
source:housenumber=local knowledge

Source: Mapillary
https://www.mapillary.com/app/?focus=photo&pKey=779963127419245

Note, there is also a staircase entrance to the south signed housenumber 3. It is completely possible both have the same housenumber, because housenumbering is not so straightforward in Ireland.