The short version
Yen So is a southern urban edge where a large park and lakes sit beside housing, logistics and major roads. It suits someone who wants open space and a newer edge of Hanoi, provided they accept that the park is not the same as a walkable town centre.
The exact address decides whether the green space is a daily asset or simply something seen from a road. Check shops, school routes and transport beyond the estate gate. The area is easier with a motorbike or taxi, especially when errands do not align with the local development.
Yen So offers breathing room at the cost of urban immediacy. I would choose it for a south side life, not for an effortless central commute.