Fáilte Barbara!
You are in luck...
Click here to read a folklore tale collected by George Daly of Slattagh National School (dating from 1937-39).
It gives George Daly's address as Caul, Scramoge, Co. Roscommon and names "L. Donohue" as the person who told him the story.
So, you need to find the townland of Caul, just south of Slatta Village (where the National School still exists) and east of the tiny Village of Scramoge (site of the famous Scramoge Ambush of 1921).
Caul was a Donohue stronghold in the 19th Century (see Farm # 6 in Griffith's Valuation). Their extended family cluster at Caul#6, was a pre-famine village/ clachán in and of itself, sharing approx 88acres of farmland (rundale system). Caul even had its own animal pound back in 1837!
There were 5 Donohue households there in 1911. It would appear that this was John & Lizzie's 1911 Census record. (Can you confirm the other family members?)
In any case, what you are looking for is a small road leading up to this cluster of Donohue homes (and the buildings themselves, some derelict).
The co-ordinates for this cluster are 53.784687, -7.980877 which you should be good to access Google maps and Google Street View. For comparing historical maps from 1837 and 1900 to the latest aerial views, see GeoHive.
A working farm is still there, so you should be able to get local help pinpointing the exact house.
Best of luck!
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For more 1930s stories from Slattagh National School click here.
You could try the eir phonebook to see if anyone of this name is living in the area today.
You might also like to link in with this IrelandXO thread on Caul Donohues.