Cool, uniquely Tokyo house with decent access to Shinjuku Station. There's two queen(?) size beds, a bunk bed, and a futon sofa. There are all sorts of cool amenities - heated floors, self contained drip coffee contraptions, good sized shower room, complimentary mobile 4g card
The area directly outside the house isn't bustling, but there are places if you know where to look, especially towards the Tokyo Opera.
The owners, Tracy and Ash, were very helpful over the Airbnb message system.
Only complaint is that accessing the Keio New Line from Shinjuku Station isn't as straightforward as it could be (Google Maps doesn't lie when it says it's a 7 minute walk from the Yamanote line).