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I'm usually half size up in running shoes. You want it to be snug enough around the middle of the foot that your foot doesn't move around when laces done up properly, but roomy enough in the toe department that when your feet get warm and expand a little, you're not hitting the front of the toe box and losing toenails/getting blisters.
@jj72 I wear a 10 street shoe but 11 for running, always size up as you want room around your toes and your feet will swell a bit too. General rule is a thumb width between tips of toes and end of toe box. I have a pair of asics cloud nimbus 21 and they are true to size and I have narrow feet too. I assume their sizing is consistent.