Went here for dinner, was blown away, came back twice more.
First of all, the staff are the most courteous I've met - and for Vietnam, that's saying a lot (Vietnamese hospitality is the warmest and most sincere I've experienced in all my travels). They speak English anywhere from adequately to well, but certainly with enough understanding to cater to any dietary restrictions without any problems.
If you read a little about this place, you'll see it's part of an Australian-Vietnamese foundation helping give disadvantaged/street kids a shot, and they have a 100% success rate at finding these kids jobs in the industry after their training has been completed. In fact, many of the more up-market restaurants in Hanoi have graduates of this program working in them. So, you're supporting a great cause by dining here.
KOTO restaurant is like a casual eatery downstairs and has a funky bar/lounge upstairs (they serve the full menu on both floors, I chose to eat upstairs each time as there's a nice view and a more relaxed vibe).
The food experience: First dinner we had the fresh spring rolls (we asked for vegetarian which was no problem), the honey prawns and bun cha, with a fresh juice and the house made ginger and lemongrass tea with honey. The spring rolls were deliciously fresh and moreish, the honey prawns were absolutely wonderful with plenty of vegetables and a bowl of rice, and the bun cha was huge and very tasty. The drinks were delicious - the tea came in a big pot and was absolutely amazing with rich flavours.
Second dinner we picked the cha ca la vong and pho xao bo, and each had a cocktail (mine was the ginger martini - yum!). Again, delicious food, huge servings! I was also given a little chocolate mousse cake as it was International Women's Day - a nice touch.
Third visit was for lunch and we had the Bun Cha, one beef and one tofu. Yum, yum, yum. Fantastic way to end our stay in Hanoi.
I can't praise this restaurant enough. Service, ambiance, and quality (and value for money) of food is exemplary. Really pleased we visited!