Since I have neither the space nor privacy at home and I spend most weekends in a shed out in my woods (where I work), I plan to build a cupboard on top of an existing table.
Basically building a box on the top and thus having a new top to the table that is a foot higher than the existing one. The door to the cupboard will be on the front of the table not the top. I'll put a shelf on drawer runners at the bottom of the box so my doll can lie prone on that and be pulled out for easy lifting (or sitting up on the shelf against the box/table top). I'm expecting there to be 'dead space' for much of the doll's height (or length, depending on perspective), so I can add a drawer to the underside of the table top (within the cupboard) to contain clothes and accessories.
When I finally get my doll, I shall get on with making this and post some pictures of it on the forum
I'm sure the same idea could be used in normal houses with a new coffee table or sideboard