HI we went twice last year in june & sept , but only for 3 nts and 5 nts to siem reap which is long enough to see the temples and other places of interest .If you go for 2 weeks it would be best to travel around the country . You would be best to book your first night then have a look around and see whats what
http://www.mollymalonescambodia.com/inde… look at this b/b it is expensive for what it is but its right at the end of PUB STREET where all the action is at night time
Also look at www.hostelsclub.com they do b/b guest house and hotels
For flight look at www.flyingeagles.co.uk
We done cambodia and vietnam on both trips
You can get your visa for cambodia on line if you have PAY-PAL its so easy you just scan a passport photo and they email you the visa and you print 2 copies