If you've not been, Lisburn's... not that kind of vibe.
Having just checked, it's a chain in NI:
http://www.littlewingpizzeria.com/
Quite nice. Definitely not the sort of thing the OP is looking for.
I went to a very nice pizza place in Lisburn the other day, if that helps.
It definitely wasn't authentically Italian.
Or reasonably priced.
But it was open at 9pm on a Sunday.
Also I can't remember what it was called.