We stayed at Ons Stop Hostel in Siem Reap in a 8 bed dorm with shared bathroom and paid $7US Dollars/ $9 p/p/n.
Breakfast was not included but great value at $2US / $2.60 for an omelette with toast, fruit and your choice of tea, coffee or juice. Instead of the omelette you could choose a pancake or muesli. The rooms were spacious, the common room was a great place to hang out and escape the heat outside but the bathrooms were stuffy, humid, smelly and hot. Not ideal.
The location was great however, right near pub street and both night markets.
The hostel staff were also very helpful and extremely friendly and helped us book bus tickets to Bangkok.