Long Term Stay in Vientiane, Luang Prabang?

Not sure about Vientiane but You Should get a decent place below $500 per month in Luang Prabang, Check out this post for some advice on budget accommodation, they have 1 or 2 listed for laos below %500 http://www.digitalnomadcommunity.net/articles/2013/04/24/10-places-to-stay-around-the-world-for-under-500-a-month/