This place is run by a nice, young Khmer guy. It is named after his sister, Reaksa, and is located at the bottom of Thupal Street (past the bike hire places and all the other shops). Look for the Coke sign that says 'Reaksa'. I can't comment on the other food but can highly recommend the Khmer BBQ. For $8 (for two) you get a little BBQ at the table with a piece of pork fat on top and a load of stuff to cook yourself. As the fat melts you cook shrimp, bits of beef, squid and vegetables. This guy adds some broth to the 'bowl' of the BBQ so you can poach the vegetables as well. A mountain of delicious food, very reasonable and great fun to cook as well! Try it!