My wife once suggested this, and I wish I would have taken her up on the offer. I once designed - well sketched - a Siamese flats arrangement with the two living spaces joined at the kitchen.Love this. And totally get it! As a serious introvert, I once suggested to my husband -- whom I loved dearly and wouldn't have traded for the world -- that we buy a duplex and meet every day around the cocktail hour. He was so hurt, I never brought it up again. But good people, I was serious...
My ideal marriage would be my wife pursuing her art in her office/studio, me doing my stuff in my office, then we meet up for lunch, the cocktail hour, dinner, date night, and the occasional round of 'your bed or mine?' The current Mrs PMarky is a bit too coupley for me not to go nuts occasionally.