Do your research, there are complaints all over consumer sites!!! Everything from illegal workers, owner is a felon, ex-***, ripping off employees, etc.
RUN for your life and have your hardwood floors done by anyone else. I have first hand knowledge of their practices. They appear to be legit. However their license information is impossible to find, as well as their address.
But they are at 1010 Cannons Court, Woodbridge, VA. Owner's name is Dwight Vanover and partner is Ronald Cooke.
Don't buy into how many years they have been in business. I'm sure Dwight's forefathers would be disgusted.