“Good story” would be something like scéal mhaith.
They’re using deas in this one, which translates as “nice”.
Hopefully someone will come along and correct me on the “good story” part, but this would be the first time that I would be wrong today. (Of course, it’s just after 1am as I type this. In the next 7 hours or so, I will have been wrong at least a dozen times!)
scéal is a masculine noun, so scéal maith.
You can use the Grammar Wizard at teanglann.ie to check this type of thing: