I stayed together with my friend 2 nights at the Golden Tour Eiffel Guesthouse in Phnom Penh and I can absolutely recommend this place. The rooms are spacious, clean and definitely worth the price. The owner Mr. Sna is very competent and can help you with anything (e.g. booking bus trips, sightseeing tours etc.).
We felt very welcome. Also the location is great. It takes a maximum of 10 minutes to get to the city center by tuk tuk. I would definitely go there again.