Ohkubo was a great host! He was very accommodating and left us some snacks. The flat is located in Korea Town, and there are a ton of places to eat nearby. The JR Line station is very close, and Shinjuku station is a 15-20 minute walk away. We really enjoyed the different experience that Ohkubo's flat provided (we were previously in a different area of Shinjuku that was a little more business-like).