First point to note is that the area is definitely a bit..interesting. Or you can substitute interesting for intimidating. A bit sketchy especially at night but all I can say is that once you eat here it might even be worth coming back even if it was in the ghetto of the ghettos!
I haven't had the omakase that a lot of people have raved about on here and other sites but everything else is just as good! I've ordered a-la-carte with my friend a few times and the toro and hotate is to die for! Every time we eat anywhere else we always find ourselves relating back to Zen and how its better. Another fave is the spicy tuna roll, yum yum!
Service can be a hit or miss for some as it's the basics. Depending on which waitress you get, there may be a slight issue with communicating.
The decor is nothing special as well and doesn't look like it has been updated in years but that's not what you go to Zen for-you go for the food!!
Overall really fresh sashimi that's melt in your mouth goodness!