There are only fragments of the 1851 census surviving.
also allows you to search but leads you back to the NAI. You'll need to register for free to do this.
Spelling was very unfixed in 1851. Consult the 1851 Townland index
for the official spelling then.
Note: house numbers should be mostly disregarded unless in a city. Census enumerators assigned numbers using their own system to ensure they counted every house. This system varied from census to census. On the later ones, 1901/1911, when you view the building returns, you can work out if it's the same house from the windows/rooms section.