I stayed for 4 nights in this guest house, and am happy with my stay experience.
For only 60,000kip per night, I got a room with a double bed, hot shower, cable TV and wifi, and the location is right in the centre of Vang Vieng, with good restaurants, cafes and bakeries just next door ! The staff are friendly and helpful, always making interesting and funny conversations with their limited English. Though it is near the main street, most of the rooms are further inside the backyard so it's pretty quiet at night and I was able to sleep in peace for the 4 nights.
For this price, this is great value for money for the budget travellers.
Tip : for those driving your own vehicle (like myself), this guest house has plenty of private parking space in the guest house compounds away from the main street. Great for peace of mind in a party town like Vang Vieng.