I nearly always bring a scroll of magic mapping for this quest because there often is a small separate room somewhere on the map where the last couple dark ores are found. I find it very tedious and food/health intensive to blindly search for the room. I mostly only skip the scroll of magic mapping when I’m very overpowered or have strong sustainability.
The problem with being a long time renter, is that there is no guarantee that the real estate will always be available to you.
What if your landlord sells your house/appartment and the new owner wants to move in? What if the rent hikes eventually make it unaffordable for you.
Unless you own the property, you cannot plan with certainty for the long term.