Unfortunately I didn't get the chance to meet the hosts Mao, Yoko or the Zens team, as my flight arrived fairly late. They did provide very concise instructions on how to reach the apartment from the airport, including an online doc you can download which details buses and metro lines to take, including pictures.

The apartment is very conveniently located on the Keio new line, two stops from Shinjuku station.

With Tokyo being such a hug metropolitan area, it would be unreasonable not to expect some road noise and the apartment is next to a busy road, however I quickly got used to it & always had a good nights sleep.

The apartment itself is small but very clean and has Muji furniture which is all new / very nice. It also has a small "pod" style bathroom. All in all it was perfect for me as a solo traveller.

The neighbourhood has many small eateries & at least three supermarkets / 7-11s within 5 mins walking - all in all a super convenient base from which to explore Tokyo. I would certainly stay again.