Koichi's place exceeded our expectations! Everything was as stated in the Airbnb description. First and foremost, Koichi is such a wonderful host! He picked us up at the Shinjuku station during Golden Week (super busy time) and showed us around the apartment before leaving us on our own. He even helped drop us off at the closest Shinjuku station exit for the Narita Express when we left Japan. (SO HELPFUL as we ended up with extra luggage due to souvenirs and shopping :D ) Koichi is also very thoughtful, friendly, and quick to respond.
Secondly, the location is great! A 7/11 is literally just around the corner, and a super market is just a few blocks away. This was super helpful for quick morning or evening bites. You can walk to the Shinjuku-sanchome station within 10 minutes, and the Shinjuku station within 15 minutes. Our grandmother (88 years old) who is fairly active for her age was able to walk to these stations within 15-20 minutes with us, as she took little pit stops to take pictures along the way! Koichi's place is also very close Golden Gai.
The portable wifi was also a plus! It was also very convenient to have a washer in the apartment, and a coin laundromat right across the apartment building's entrance for the option of a dryer.
We will be staying here again if we come to visit!