Your freelance website should not contain ads any more than your printed resume should contain them. The tiny revenue generated by advertising will never be worth the unprofessional appearance that ads convey. And if you run ads because you have a free site, well, reconsider. That site ain’t free. You’re paying in lost customers. Pony up the money and lose the ads.
I recently visited a number of writer sites to get ideas. It was amazing the ads for weight loss, digestive solutions, testosterone builders, and search sites that could look up anything on anybody. Even pop up ads. Enough!