My wife and I will be spending the first 2 weeks of October in Cambodia, Phnom Penh for a few days then the rest in Siem Reap. There seem to be (too good to be true?) good deals online for hotels, however, do we really need to book ahead or should we organise everything up front? Always worried if we pay up front we are committed to what might turnout to be awful. Budget is flexible, although would probably prefer guest houses for the experience.