This is my absolute ideal.
I don't really have many belongings and like to travel light. An iPad, a toothbrush and I am good to go. DH has collections .... and says he likes sharing a home.
When we first got together, we never, and i mean never had any arguments. In retrospect, I see that in his place, we followed his rules (loo seat up and other essentials), in my place down. It seemed as if we were perfect for each other. When we finally (sic) moved in together, nearly ten years into the relationship, it seemed all we did was disagree. He was travelling a lot, i tried to get one major job done in the (new, joint) house, every time he was away. Eventually, he said how he hated that every time he came 'home' something was different.
It's settled down now, fifteen years on, but now my ideal would be a joining flats. Not to far to go for the fresh milk, but each having our own space, where what we say goes, rather than having to negotiate and compromise on everything.
Certainly would never share a house again, with anyone else. Sigh.