When we got together, we lived about 60miles apart, so a good hour's journey. Moving was not practical, since we both worked even further apart. Fast forward nine years, his new job means he just needs to be near the airport and we finally move in together.
Having literally never had a cross word, we had the same bickering about , well, everything for ages, til we settled down and just accepted that we each couldn't have our own way about everything. I still hate how the kitchen cupboards are arranged but just don't let myself think about it. I like to thrown things out and he , well he likes to keep things, so the house is slowly filling up.
So, yes, my ideal would be flats by side, where, without thinking about it, we do your rules in yours and my rules in mine. Bliss.