Norimasa's place is exactly as described. The tatami room was nice, and the bed/blankets were really nice specially for the cool weather (we're from the tropics so 15-20degC is quite cold for us). The location is amazing and easily accessible to the train station. It is amazingly near a lot of bars, restaurants and shopping places. I
The only con is that even if you can spaciously fit 4 people in the sleeping area (tatami area
= around 70% of the space) luggage management is a problem - you can only fit 2 pieces of luggage (i.e. wheels and all) in the storage area near the door and then you'll have to find spaces for the rest. If you are traveling light, this should not be a problem. If you're a family of 4 planning to do heavy shopping, then this will be a bit of an issue. The bathroom is also quite small from what we're used to, but it was clean and had everything we need.
Norimasa is a great host and easy to talk to. He responds very quickly and is friendly. He sketched out a map for us of great places to eat (Aoba Ramen was amazing) and location of groceries/shops. I would definitely love to stay here again when in Tokyo!