This would be a really interesting thing to implement, though probably fairly difficult if you wanted the furnisher to actually suggest items for your house. I would definitely love to decorate other people's houses, though - I've spent ungodly amounts of time on my own already.
A potential but probably excessively expensive (in terms of real money) way to do this would be to give the furnisher a budget in crowns alongside your style preferences and specifications, have them decide what furniture would fit in your house from the crown store that fits that budget, and then buy the items and pile them in a corner to let the furnisher arrange everything.
It's also somewhat limiting when it comes to items only available with gold or from achievements, but there's no reason not to also send your decorater other items you might want included, or give them a gold budget as well.