Nice cozy place, the bed was firm but comfortable for me. Heater and hot water worked well which was especially important in February when I was visiting.
It's close to the station (between a 5 to 10 minute walk) and Shinjuku station is about 10 minutes by train from the nearest station, Harajuku and Shibuya about 20. If you plan to go to Ginza, Odaiba, Disney etc they're all east so keep in mind those will be about 40 mins to an hour away by train.
Instructions for check in were clear and had a video as well. The host responded to any inquiries quickly and was kind enough to store my luggage for a few hours when I checked out. I would keep in mind the stairs up are narrow and steep so be careful if you have lots of heavy luggage.
PS - I didn't sleep in the loft but I checked and it had an outlet and its own light
Overall a nice place, felt safe and was suitable for my needs!