There are many restaurants around Siem Reap town. But I would recommend some of very good Khmer food, Western food , Thai food  , Veitnamese food and Chinese food.

Angkor Mondial / Kolen II Restaurant
Asian / International / Traditional / Perform dances. Dining and traditional performance available budget style and a la carte. Full bar with cocktails, Indoor, A.C.
Nightly APSARA dance show 7.30pm.

Blue Pumkin: Restaurant very popular .
 Throughtly modern restaurant/bar offering contemporary menu upstairs with full bar .
 Free WiFi access .
 Nicely prepared pastas, salads, pita sandwiches and finger foods, burger and breakfast good fresh made ice creams. Reasonably price.

Borey Sovann Restaurant:
Khmer well established Cambodian restaurant covered cool open air dining offering and extensive menu of Cambodian dishes.

Chaopraha Restaurant Steak House and Coffee Shop  
Upscale Steak house and family restaurant serving importance steaks and other western and Asian favorite service.