First i have to say i did not stay in this guesthouse but my review is for another service they offer. Renting (motor) bikes. We want to rent a bike there (25000 for 2 days is the cheapest in LP !). They want to see my passport. Then he wants to take it as long as we rent the bikes....... 1 thing is holy in asia and that must be your passport. Never give it away. So i said " no". I told him that he could make a copy but he can not hold it. then he said: "we take special care of it" (they put it in a drawer not in a locker !!) and "when it is not here anymore when you come back we will arrange a new one".
What did you just say ?????????......... OMG. Later we saw a few papers by another shop. They want your passport because if something happend to the bike they charge. When you lose the bike you have to pay a new one. If you dont pay you dont get your passport back, and THEY make the price of a new bike.
Luang prabang is 1 big scam and tourist trap. It is a beautifull place but also a horrible place because of this kind of things.
I just want to warn other people with this post. Look out and never, never, never give away your passport.
Have fun.....