Ebay don't allow you to exchange contact details until the seller has agreed to buy and has paid for the item.
Then you can arrange a viewing.
If they decide it's not for them, they can then have a refund.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)