We will be in our new house (hopefully) sometime in early 2017. This is the Ottawa based team who will be helping us:

I have never lived in a new house. I have never built a new house! We've been asked to come up with a list of personal wishes or suggestions concerning how we want the house to look and function. 

I don't know anything about this type of creative process so I'm throwing the question out to you:

If you have planned and built your own space before (or have done extensive remodeling on your home), what were key features that you insisted on?

Any and all tips concerning this scenario are welcomed!