Mittaphab Club and KTV is the nightclub of the Mekong Hotel on Souphanouvong Avenue. It is about 500 meters from the tourist center.
I saw it as I was walking by and I decided to have a quick look. The entrance was free and I just had one beer (25,000 kip).
It is a rather large disco but less than 50 clients were there. It is a bit old-fashioned: You have a podium for the live band, a dance floor just in front of it, and used sofas all around.
The music was Laotian. The male customers were above 50, with some Chinese, but most girls were in their early 20s (except a few older ladies). Obviously, they were hostesses from the karaoke next door. In fact, after a quick research on internet I discovered that the Mekong Hotel is a hotspot for prostitution in Vientiane and that girls from the club can be taken to a room. Prices I found were 90,000 kip for bar fine, 300,000 kip for short time and 600,000 kip for long time.
Depending on the song, the customers would all start to dance in groups in a funny way as you can see on this video I took inside:
Overall: Unless you are looking for prostitutes, I don't see any reasons to visit this place. Read my Vientiane Nightlife Guide for better alternatives.
Mittaphab Club et KTV (also spelled Mittapharb and Mittapharp)
Souphanouvong Road Vientiane
Open every day until 12AM