Do not book this bus (Kratie to Siem Riep) you will get kicked off the bus for 4 hours in a nowhere place in the north of Cambodia then put on another bus and not get your seats. There are cheaper direct buses. Awful trip.
Kratie to stung treng toke a 1.5h to get out of town and was in a really bad state in stung treng we got dropped nobody know where we should go the man at the guesthouse house was a asshole and the drive to Siem Reap was driving like a maniac