1-2 mg/kg with 1.5 being a general sweet spot in my opinion.
Edit: look into brown sugar vs. washed mdma to figure the difference. Supposedly unwashed mdma has a mellow quality washed stuff lacks. Better for going out vs chilling at home with friends supposedly. I could see what's being said, but it's not as easy as more or less physical /mental effect plus I don't have enough experience.