Located on top of the Ebisu Atre West building (the one with Shake Shack at the ground floor). There are elevators outside next to Shake Shack that go up to the 8th floor. There are quite a few tables that are free to use. Surprisingly the Atre WiFi is very fast.
I think the best time to use the space is either early morning or late afternoon, as you can get some shade and it will be less crowded. Since the space is shared with a restaurant, it can get a bit busy and noisy if there are large groups using the restaurant's outdoor space.
Restrooms are located one floor down, next to Din Tai Fung.
The unique interior style and extensive menu is definitely the highlight here. The food options sound really good and the drinks menu has a little bit of everything (tea, coffee, sodas, cocktails). There are a couple of large worktables, some smaller tables, and a lot of counter seating (good if you want to work standing up). There are some drawbacks for working though. The seats are not particularly comfortable though (hard wooden chairs). Some power outlets scattered around, but there was no WiFi unfortunately.
Nice design, and it is workable if you have your own hot-spot, since there is no WiFi. Also the back downstairs seating area has essentially no docomo reception. I didn't see any power outlets. Menu is coffee only (no tea available).
A cosy café but not great for cowork unfortunately. The WiFi is slow, there are no power outlets and apart from one big table the tables are tiny. It seems quite busy during afternoons and while the space is big most of it is reserved for events and not actually open to café guests. They play some nice background music at a good volume on what looks like a fancy stereo though.