Me and my friend come here all the time. Great authentic food, for a great price. Especially for Central London. You can't find that price elsewhere in Central. Bring cash because card is not accepted here. I always tip because the food is always tasty (the curry ramen is my favourite thing to get here). The staff are always very friendly, despite it getting very busy and crammed here sometimes. It is one of those places where it does not look like much from the outside, or when you walk in, but the food makes up for it. There can be a wait queue to get in, luckily I have never experienced which but be prepared for that too. My only issue is that it would be nice to have a bit more veggie option here though as the choice is somewhat small. Otherwise, this place is a hidden gem that you should check out for yourself if you're craving some authentic Japanese food for a very good price.