There's an American in Ireland at the minute searching for his ancestral home in Dublin. His great grandparents are from the city but he only has one photo of them before they left.
A friend of his has posted said photo on Reddit today, offering $150 to anyone who can tell them where the house is.
The Redditor says
It looks like, to me, this is on an east/west street given the sharp lighting from the side.
Found rough birthdate...
Her name was Rose Ann Carson, and married Horace Decker on April 5, 1893 in Detroit. She was Born about 1863 in Ireland. She died March 5, 1938 in Lansing, Michigan, USA.
She is the old woman in this photo. My friend says this image is likely in the 1920's or early thirties. Here is theFamily Genealogy page.
You can see the full Reddit thread here if you want more info or have a clue where the house is. I've no idea myself.