There is oodles of space in those units! We stayed in one last September.
You could use that cabinet you mentioned for clothing in you wanted to.
We put the suitcases themselves in the various closets throughout the place and just had clothes in drawers etc...I actually put the kids clothes in the master bedroom drawers because after showering they would get dressed in there, but you could definitely find places in the living room area to store things as well as the closet in the master bath area (which is separate from teh shower area and the master bedroom).