Double N Services - Carpet & Upholstery Cleaning is really great, we use them exclusively and have been since we found them in Angie's list.
They have great customer service and they are very efficient and if there is something that I don't like too much they come back with no questions asked. This happens very rarely of course but it's nice to know that if something doesn't come up as planned that they are willing to come back and give it another shot.
They are extremely prompt and very courteous.