You should live somewhere close to work on the Orange Line. Arlington and Falls Church City are your best bets for a more suburban lifestyle. If you want to be in the city, West End is best for its proximity to Foggy B
I have to ask— does your expat package include an education allowance? You should begin researching private schools to determine whether or not they would be able to accommodate your children’s needs. You’d be surprised how quickly school heads will respond to your queries.
Your children could also attend Saturday school here to keep up their mother tongue:
https://www.wjls.org/eng-aboutwjls/
Washington Japanese Language School