Double N Services is a company that I have been using for years now. We can't use them when we're in Florida, but we did use them before we moved out of our house. They cleaned our marble floor, giving a buff and a polish. My only issue is the floor didn't look any different after they cleaned it, though that probably wasn't their fault, as it may have had more to do with the type of marble flooring. Their office is courteous, and flexible with their scheduling, and their workers are respectful, and on time.