Standard best storage practices apply.
No wild temp swings
Cool and Dark
No direct sunlight
Beyond that it's up to you. I use the refrigerator because of the heat extremes here. Some debate if it's better or worse than a cool closet (pantry) But it's the only way I can keep it at a consistent temperature. Temperature swings from hot to cold is a good way to ruin anything.
If I had a root cellar I'd keep it there instead of the fridge.
Oxygen degradation of the nic seems to be a long term storage issue, so if you want it to last years, top that bottle off instead of having a bunch of half empties. But hopefully we are talking years for this to be an issue.