I am very grateful to Yasuyuki for his hospitality. Although we never met him in person, he always went above and beyond to make sure we were safe and comfortable. Communication was timely and he was proactive about contacting us, making sure we reached his apartment with no issues. He also left us some delicious snacks and bottled water!
The apartment itself is exactly as pictured. Comfortable beds, clean and tidy spaces, warm even during the bitter cold of Tokyo's December. The kitchen area is a bit tight, but that was no issues for us as we were too busy eating our way around Tokyo. There is a coin laundry within the building - 300Y for the wash & 100Y per 10 minute for the dryer. I recommend using the laundry early in the morning as there is a bit of a queue by midday.
Location wise, the apartment is located a convenient 3 minutes walk from the Toei Subway Shinjuku Station and 5 minutes walk from the South Exit of JR Shinjuku Station. From these stations, you could quite easily reach the airport and other parts of Tokyo with minimal line transfers.
Yasuyuki is an excellent host and I would not hesitate to recommend him to anyone.