Ours was a really big group, composed of 17 adults and 3 kids, had a really, really great time at Masato's home. The whole place was very clean and comfy, with amenities such as washing machine, bathtub, fridge, oven and microwave. It's conveniently located between Izumi-Tamagawa and Komae train stations with lots of convenience stores and restaurants within walking distance.The neighborhood is also nice. You can really call it your home away from home.
Masato immediately responded to our questions before and during our trip, which was very important to me. But what made me super grateful to him is when he notified me immediately, through the other members of our group, when he found out I left my phone in his home on the day of our departure. We were already at Narita so going back to Komae-shi for my phone was out of the question. Good thing one of my friends was in Amagasaki. I requested for him to send it there via courier and he did so immediately and for FREE. That simple act meant a lot to me. Indeed, he is one great superhost!
If you'll be in Tokyo and you need a place for big groups, book Masato's place. Satisfaction guaranteed.