The check in via iPad at the entrance did it work as the iPad couldn’t connect to the WiFi. After struggling for 30mins I contacted the host and he responded very quickly with the code to my room.
Room is smaller than it appears on the picture. Would not recommend staying there with 2. Maybe only if you travel with a backpack each, otherwise no space at all to open your luggage. I was there on my own with 1 big and 1 small luggage and it occupied the whole area. Everything else was fine. A bit annoying to climb up the ladder to get to your bed but the price was unbeatable! Nice location too. Walkable to Shinjuku and close to the subway. Also located close to a big street with lots of shops, restaurant etc.