Gravina’s Window Center of Littleton Earns Esteemed 2020 Angie’s List Super Service Award Award reflects company’s consistently high level of customer service    Angie’s List Super Service Award Winner for 2020Littleton, CO, January 21, 2021 – Gravina’s Window Center of Littleton is proud to announce that it has earned the home service industry’s coveted Angie’s List Super Service …