Oak Hostel Zen

Great place

Plus: Very clean, the place looks great. Slept in bunks with privacy curtains, would recommend bringing earplugs tho if you are a light sleeper.

Great location

Plus: The location is near the subway station and several places to grab a quick bite. Really beads are comfortable, but you need to make the bed yourself (I think this this a Japanese custom, since the same applies to the other hostels I stayed at in Japan). The staff were all helpful and friendly.