There is a website : Abertillery Family History

You can't do an address search on the 1901 census and at the moment I don't have access to the census returns to check whether the number of the house is listed. Electoral rolls/street directories etc may help.

The actual address is:

Gwern Berthi Road, Cwmtillery, Abertillery, Monmouthshire

If you Google this address - and put in 29 - you will be able to see the actual house.