I showed up to 11 Happy at 1am (night bus from Sihanoukville) and the staff was awake and willing to help me find a room which was really nice. The prices were higher than I had expected and the first 3 rooms the staff showed me had not been cleaned. Finally I got a clean room, but it had no windows, was very warm, and didn't have the most comfortable bed. I personally think it is possible to find a cheaper, more comfortable place to stay in Phnom Penh. Also very confusing that there is a guesthouse with this same name on Street 258 (which actually seems to be the better choice).