My partner and I spent 10 days in Siem Reap this year and Vitking House become one of our favourite spots to eat, especially in the cool of the evening. It's lovely and quiet but the atmosphere is still warm and generous. A few wooden decks with ceilings and open sides with low tables are always quite full of local students. Sprinklers spray the garden and, as a double bonus, keep the air cool and the mosquitos at bay. I'm surprised people have described it as "out of the way". Sure, it's not on Pub Street but it's 10 min max by bike from the central market. If you staying in Siem Reap and you don't hire a bicycle, seriously, what are you doing?!
The waitstaff are all very young and really friendly. They speak very limited to no English but there are English translations on the menu. As well as Khmer dishes, they offer Western food like burgers and sandwiches but we steered clear of that stuff coz it looked a bit sad. Everything we had was tasty and well balanced with plenty of fresh veggies but nothing to write home about. Some dishes bordered on bland but, then again, Khmer food isn't heavily spiced. It's easy to over order and over eat because everything is so cheap. They have an amazing selection of shakes, including pumpkin and taro but we weren't able to get them made vegan.
Cons: little English spoken (although I hesitate to list