Empress Angkor is a beautiful hotel, with an amazing lobby (complete with welcome drinks when you arrive), swimming pool, fitness centre, free wifi, souvenir shop, complimentary breakfast and beautiful spacious rooms. It is a little way out of Siem Reap centre, on the main road and closer to the airport and Angkor complex. The staff are professional and very well presented. We experienced three disappointments, however, that stopped this from being a 5 star review.
First, the shower temperature fluctuates wildly from too hot to freezing cold. The rooms are not very well soundproofed (we could hear everything going on in the neighbouring bathroom, for instance). The biggest disappointment, though, was the restaurant. The breakfasts were lovely, with ample servings and plenty of choices. We ate dinner there three times, though, and for the price of meals (20% service charge not included!), the food simply wasn't good enough, and we aren't very fussy eaters! I ordered a Nasi Goreng for room service that I would have sent back had we been in the restaurant - the chicken skewers arrived cold, and were simply indelible for they were full of gristle. My husband ordered a club sandwich which did not contain all the ingredients as described on the menu. These sound like small gripes, and they are, but when charging $10 or more for a simple meal (enormously expensive for Siem Reap), it is important to get the food right.
Overall, I would say the rooms represent very good value for money (we booked via asiarooms.com and paid $70 per night for a deluxe room), the 'wow factor' is there, but I would give the restaurant a miss.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC