I agree with the above statements. If they want it they will come. The right person just hasn't come along yet. Don't give up. If the price is right, it will sell.
I would tell anyone that wanted to look, that I would hold it from the time they left their house to come to look at it. I wouldn't even ask for a deposit, or even take a deposit. But I would have to get an exact date and time that they would be coming to look. And if it wasn't soon I would tell them to call be before they left their house, because it may have sold
already. If someone else called and was interested in looking at it, I would make an appointment and offer to sell it with the same understanding. I would sell it to the first person with the money and call anyone that had an appointment and tell them that it was sold
You can not afford to hold it for someone that isn't on their way to see it.