Just to even the balance of opinion, my ducks have a room in the basement. I tidy up daily (takes 15 minutes), manage the water appropriately, and there is no unpleasant smell. Mostly the aroma of pine shavings. They spend much of the day outdoors in their secure pen, and come in at night...
For what it's worth, I keep our ducks in a walkout basement pen near the back door. I put shavings down and at first the pen walls were puppy pens. I have now made a basic frame with plastic poultry fence attached. I have a watering station so the floor does not get wet. It is kept clean so...
It rests in your hands entirely. Think about it. Are you someone who keeps things cleaned up, picked up and tidy, at least some things (the ones that matter most to you)? I found I had loads of work to keep the house smelling good with the ducks inside, but I did it.