I stayed at Nostalgia House with my wife and three of my friends: even with all five of us staying there, we had enough room for all of our things. The location is very hard to beat as it is close to the Takadanobaba JR Station and a Tokyo Metro Station, which gets you to Shinjuku, Shibuya, Nakano, etc. in less than 20 minutes from leaving the front door. It's nice because the Takadanobaba stations are less crowded than nearby stops and are much easier to navigate. Chishin and Tomo are fantastic hosts who worked with me and my friends every step of the way, which was great because I lost my smartphone shortly before our stay. Luckily, a little bit of extra effort from our hosts made our stay easy and free of issues.