For those who love to explore some local street food with a local person for a half day, this is an excellent idea. It is also a good way to be inside the City with different eyes about Hanoi.
For those who have not enough time to spend a night in the surrounding of Hanoi, or just want to do a day trip with a small of group of some other travelers. This is a nice escape of the City.
For those who love to get an idea of village's daily life and an understanding of Northern Pagodas architecture, and wish not to be with a group, this is a good choice for a short time stay in Hanoi.