宋家族亭 (Sòng jiā zú tíng) serves Japanese food and is very near the apartment where we're staying right now. (We'll be moving to an apartment in a different part of the city in a week or two, so we figured we'd better make the most of visiting restaurants near our temporary abode while it's still convenient.)
To get to 宋家族亭, go to the Marina City shopping area. It is nestled away between the Adidas store and the Converse store.
The first thing you notice when you walk in is how enthusiastically the staff greets customers. Both times we have gone, there have been about 4 guys working, and usually, whenever a new customer comes in, at least 2 of them will shout, "欢迎光临!" (Huānyíng guānglín, which is the way businesses say "Welcome" to their customers when you walk in.)
The second thing you notice is how clean the restaurant is. Most Chinese restaurants, especially those that aren't inside malls, have a bit of grime, at least in the corners. However, this restaurant is spotless.
The third thing you notice is this nice philosophy in the inside of the menu:
Now, how about the food itself? So far, we have tried the following dishes from this restaurant:
1) Japanese ramen noodle soup (日式拉面) - cost 19.5 kuai, or about 2.9 USD
2) Curry with squid rings (鱿鱼圈咖喱) - cost 22.5 kuai, or about 3.4 USD
3) Curry with pork (猪排咖喱) - cost 21.5 kuai, or about 3.2 USD
4) Japanese ramen with fried chicken (日式拉面鸡肉套餐) - cost 33 kuai, or about 4.9 USD
Overall, we'd recommend this place. Even if you are not a huge fan of Japanese food or seafood, the flavors aren't too fishy, and there are plenty of other dishes with generic good tastes. The value is great for the amount of food you get and the quality of the service and atmosphere.
One final note - they play music videos of famous English pop songs (i.e. "Blank Space" and "Royals") on a loop. If you like that kind of music, it will be a fun atmosphere. If not, you might want to get the food to go or sit facing away from the screen, which is right above the kitchen area.
Of course, the best part about this place and other Marina City restaurants - you can go walk along the Olympic Sailing Center right after or before you eat and take some cool photos like these: