We bought a house and had been smelling a faint smell of gas from day 1. It turned out that our gas fireplace needed a new pilot assembly and frankly we didn't really understand how to use the remote controls for the fireplace anyway so we gave Hearth and Home a call.
Our service person was excellent - polite, efficient and tidy. He fixed the problem, gave us instruction on how to use the remote and checked over our other fireplaces for good measure.
They don't clean the chimney if you have a wood burning fireplace but I would not hesitate to call them for any other gas fireplace issue.