For the basement stairs: cabinets, stairs with flip up steps and very narrow stairs. Each step goes up one at a time for each foot. It is sort of spaced so you are putting one foot per step with a steeper step. Very space-saving.
The Living Cube by German designer Till Koenneker is a clever structure, combining all those elements we usually struggle to find space for in a tiny apartment. It houses a walk-in closet, ample media storage, and serves as a loft bed.