Like another reviewer, I also stayed here on an Explore trip. The hotels they book are usually of a pretty poor standard and although this one was a bit tired out the staff and service made up for any deficiencies.

We had to move rooms late at night when we realised that the aircon wasn't actually cooling the room. They obviously have some issues with the ac units as it took two more rooms to find one that was working, but the staff responded quickly and efficiently when we reported the problem.

Thankfully we were very tired when we finally checked into the Princess in Phnom Penh. The top of the mattress did not exist..it felt like we were sleeping directly on the springs! There must be better hotel options in Phnom Penh.

I travelled to Cambodia and Thailand with Explore. I'd been warned that the hotel they used in Phnom Penh was dreadful - in fact, I'd gone armed with the address and phone number of a really good B & B and with every intention of moving there on arrival.
Explore had obviously changed hotels - this hotel was lovely. Very clean - much better than any of the Thailand hotels we stayed in. The breakfast was good, the staff friendly.
The only downside was the location - but we were able to use local transport and get about fairly easily!