I stayed 4 nights with 3 friends of mine in Shinjuku guesthouse this August-September. Min and his brother were one of the greatest hosts we've ever met. They helped us with every question we had and also helped to take care of one of us who unfortunately got sick during the trip. The rooms are spacious and clean. We loved sleeping on futons and tatami. The apartment is brand new and is located close to Shinjuku station which is basically the centre. It has free and fast wifi, a fully equipped kitchen, washing machine and also a terrace. If you stay there, don't forget to use the fire escape stairs and go to the rooftop. We enjoyed many talks up there. :) If I would go back to Tokyo I would definetely love to stay there again and would recommend this place for any traveler.