Yes, I would like to conceal the washer dryer unit under the stairs if possible. I'm not sure if it would be cost effective to do so, since the place is a rental. The square you indicated is where the unit is located on the other side of the wall.
We did recently have an inspection and discovered that the unit vents into the crawl space below the house is a code violation. So, I would also need to figure out how it can be vented to the exterior of the house.
I would like to do something like this... http://www.houzz.com/photos/613332/L...-room-montreal
..or maybe use a large, ventless, washer dryer combo.