Re: Suitibility
IMHO, since the adverts will be posted only from him and they are antiques and furniture, I do believe an e-commerce
WP theme would be better suited than a classified theme.
Remember, classifieds does not sell but advertise. Even though he can use the paypal as a method to sell his products, what happens if the user/client wants to buy two or more products? (Go, buy one with paypal then come back and buy the second one and keep doing it over and over for every product?) He needs a shopping cart for that matter and that is why an e-commerce theme would be better suited.
*Classipress is a great theme and I have nothing against it. I am just giving my opinion on what would be better in this case. (even though I might be wrong :D )
I recently came across an interesting e-commerce theme. I have no relations with them nor I have ever used their products so you're on your own to research them.
http://www.sarah-neuber.de/shop/wordpre ... p-reloaded