If youre looking for a good value sushi meal near harbourfront, Kokoro sushi is definitely worth trying.
Being a regular here, I usually get the Kokoro 4 combo which consists of a spicy salmon roll (6 pieces) and a dynamite roll (10 pieces) for the price of 11.95$. I would call 10 minutes ahead of time and it would always be ready to go when I arrive. The sushi rolls are always crisp and fresh. Sometimes I would add on a seaweed salad when I'm in the mood for a feast (Yup. A feast) and while it's not a heaping portion like the combo sets, it is still good seaweed salad.
Like others have mentioned, Kokoro Sushi is more of a take out place but there is a small bar area inside along with some tables outside. Most people usually order takeout so it's a pretty busy place during lunch and dinner time.
The service is always very friendly. I had an instance where I walked in before opening time (apparently I'm completely oblivious to signs on the door) and proceeded to order. Instead of asking me to leave, they kindly told me their opening time and told me they would put in an order for me as soon as they opened so that I could pick it up then.
Just a tip: Kokoro Sushi is closed on Mondays. I always seem to forget and crave sushi on Mondays so I learned that the hard way..
If you're in the area, I highly recommend that you give this place a try!