I have been going going here since I was little - I have fond memories of fighting over the pork bone in their accompanying bowls of broth soup with my sister.
Ambiance: The decor is full of Cambodian/Vietnamese art, and has a definitely dated look. The same carpet, chairs, pink topped tables and even menus from when I was a kid. Also, the bar shelves full of liquor behind the service desk that I am sure have NEVER been even opened. If you've never lived near Chinatown, the location and entrance might seem a bit sketchy - for me though, I just shrug it off.
Service: Don't expect gushing service here. You order, and then get your food. The waitresses will be brusque, and there probably won't be smiles. Make sure you know what you want - the staff don't really know English, so having them explain the menu items to you will just be a hassle for all involved. Also, don't belly-ache about not having been 'checked up on' throughout your meal - Asian places almost NEVER do that. If you need something, flag down a server.
Value: I find it odd that their famous chicken wings are more than $12 - and are actually cheaper than their butter beef which is about $9. Anyways, some menu items are overpriced for what you get, like their curry with baguette. Most menu staples though, are quite reasonable and won't burn a hole in you pocket. The dry noodle dishes always include a bowl of broth soup, so these are the most bang for your buck items.
Food: Their menu is a hodge-podge of Cambodian, Thai, Vietnamese, French fusion and Chinese dishes. Famous items include their mixed dry noodles w/broth soup. It's egg noodles tossed with fresh herbs, soy sauce and other seasonings, fried garlic, ground and sliced pork, heart and liver, as well as exactly two prawns. Fresh and with a little of everything, you can get a big or small order. Their deep fried chicken wings are marinated in herbs, garlic and pepper, and comes crispy hot with a lime dipping sauce. Butter beef is thin slices of rare beef with loads of fresh herbs, fried garlic and a soy dressing. Very delicious! Their take on pho noodles has a very different tasting soup - its a lot lighter, with a more pronounced star anise and pepper flavor, and is a lot less savory. I don't recommend it, as it can be weak in terms of flavor. Their Vietnamese fare of spring and salad rolls, lemon grass chicken and curry isn't the best. Go with it if you aren't adventurous, but their more exotic fare is the way to go. Their pan fried frog legs, though, are disappointing. They have a variety of mixed drinks, like fruit slushes, grass jelly, lime soda and red bean ice. These aren't really worth their price, but are refreshing. I have to admit, I have never tried their desserts...
Their original owners have retired, and the quality of their food has become less consistent. Their broth soup no longer seems to be a slow simmered treat, but something made with instant broth granules. Their dry mixed noodles skimp on the ingredients, the butter beef no longer contains anchovy fillets, and the MSG seems to run high in their chicken wings. Even with these changes, I still find myself coming back. Maybe it's because I can still taste the echo of what their food used to be like, but Phnom Penh is still a restaurant staple for me.