The short version
Duong Noi is a south western growth suburb of apartment estates, local lanes and open edges. It is distinct from old Ha Dong and works best for residents whose jobs and schools are already on this side of Hanoi.
New estates may be comfortable inside, but their gates can sit far from markets and established street life. Walk the final route and ask what remains undeveloped around the block. A motorbike is useful, while a family should try the school run at its busiest rather than on a quiet weekend.
Duong Noi is a reasonable space trade. I would live here for a newer home and west side routine, not for central spontaneity.