I lived in Hanoi for two years during which time Lai and her team has provided a fantastic and reliable service.
Visas were organised quickly, effectively and at transparent prices. No tricks, no BS - just an honest service you can rely on. Not only that but Lai has helped me (and, more recently, a friend of mine) in tight situations where visa arrangements had to be made at short notice. These situations were dealt with quickly and with minimum of fuss. My friend received their visa invitation letters within hours of asking (they had misunderstood the visa requirements and almost missed their flight to Hanoi!)
I have also used the tour company's services for booking transport to and from Ha Giang. The price offered was the best around and in some cases half the price offered by other tour agencies. The bus transfer we received was clean, comfortable and safe.
All-in-all, this company comes highly recommended.