Your first point reinforces our decision on private offices. We encourage only working 8 hours a day. This way you don't have a chance to stay late or work long hours to find that "quiet time" when everyone is gone. It's up to us, the founders, to make sure you are productive during the day.
We believe that when you come to work you should make the best of those hours so you can spend the evening with your family, friends, or just relaxing.