Momofuku is more of a fusion Asian ramen place, not really the place if you're looking for authentic Japanese ramen.
It has wooden stool seats and tables which they usually cram you in when it's busy. It's a little uncomfortable but people will wait for it. I highly recommend you reserve online to get a seat the day before or the morning of.
I usually just get their main ramen, their broth isnt as fat as normal ramen but its taste is very unique. The portions are a little on the small side but it fills you up enough to not complain about being bloated. It's a little pricey too.. Expect $15+ per person at least. Service is a little slow like when you're trying to pay the bill, but food comes at a decent time.