A northern office and university suburb
Lak Si sits between Don Mueang, Bang Khen and the Nonthaburi edge. It is a practical northern base, with government and institutional land, local housing and the busy Vibhavadi Rangsit corridor. The area is less about nightlife than about getting to work, school, the airport and the northern transport network without crossing the whole city.
The Red Line’s Lak Si station and the Pink Line corridor change the options for some addresses, but the area remains road dependent away from the stations. Vibhavadi Rangsit is useful and noisy. Local sois may be calmer but can require a motorbike taxi or car to reach rail. Visit the route in heat and rain, not only on a clear afternoon.
Lak Si works for staff at the government complex, families with northern schools and people whose work sits around Don Mueang or Nonthaburi. It has local shops and markets, but no need to pretend that every errand is a pleasant walk. Housing is generally chosen for practicality, and that is the right way to assess it.
My verdict
I would live in Lak Si with a northern commute and a building close to the transport corridor. It is a useful place to live when the map of your week points north. It is less convincing as a lifestyle choice made without a work reason.