There won't be anyone living there in the 1800s who is still alive and living there today.

I would suggest that there is no hard and fast rule. The enumerator may have taken the householders word for what they told him, or made his own best judgement of the address. I have seen addresses such as "in the barn", or "caravan" but the descriptions would have varied.
If you are willing to pass on the address we may be able to help you further, but if it was me, I would look at some old maps to see if I could narrow down the date the cottage appeared (this can sometimes bear fruit), and sometimes dwellings were named on old maps.
You can always send a PM with the address to anyone willing to help you privately.
