We Had booked 2 nights in Vangvieng but stayed 18 hrs.
The town is a dusty dump, filled with silly Chinese tourists renting noisy motor boats going up and down the river, and driving DuneBuggies on the city roads.
The hotel is falling apart, even the somewhat new building part. Bathroom is dirty and repaired with a piece of plywood.
On one side, The backpacker hostel next door is noisy until late; on the other side there is a construction site that’s in operation 12 hrs a day.
The internet doesn’t work on room floors despite multiple routers. Only the lobby and pool ones are reliable.
The only positive was a decent mattress (still firm but not hard) and fresh new nice smelling bed linen (amazingly).
If your budget is low, it beats an hostel, but for few dollars more you can find better. And keep in mind they don’t provide breakfast (easy to find on Main Street).
Left early the next morning to go to Vientiane...