I was there in Febuary, I spent 7 weeks, traveling from head to toe on my own bike.
The best roads and towns to visit are the smaller ones, on the local tracks. They are slightly more dangerous, but very rewarding!! the people you meet are just amazing.
Look up gt-riders.com
they have the most up to date information for Laos and really good trip reports to give you an idea of where you might want to go. They also have a great map - I used this map, and harldy got lost. But then again, people just come out of nowhere that you can ask for help.
if you have any specific question, just message me.
For more information on my adventures, please visit either of the following: