Scenic viewing bar in Phnompenh

Can anyone suggest a relaxing sky bar in Phnom Penh where we can get some drinks and an appetizer and enjoy the view? Sky bars address in Phnompenh? Famous skybars in Phnompenh? Sky bars with beautiful view? Interesting activities of sky bar in Phnompenh? Which sky bar is the most popular in phnompenh?