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 free "coworking" space provided by Tokyo city.
Before you visit, make sure you download the app and register an account. When you enter the building take the escalator up to the second floor where you'll find the reception.
Scan your QR code at the entrance gates, and then grab a badge.
There's seating on both the 2nd and 3rd floors. I arrived on a weekday afternoon and it was very crowded. If you want to find a proper seat you should probably arrive early. Apparently it is fairly empty on weekends.
The WiFi is quite cumbersome to connect to. You have to download the TOKYO FREE Wi-Fi profile in order to connect to the WiFi. Instructions are available here: https://wi-fi.metro.tokyo.lg.jp/en/
The clip on your badge can be exchanged for a free coffee from the coffee machine. You can bring your own drinks instead if you prefer.
A very interesting spot in Kita-Senju. It's about a 10 minute walk from the station. Apparently this is an old abandoned bowling alley that has been converted to an art space and cafe/bar. I was there on a friday afternoon and it very quiet, just a couple people chatting or working on their laptops.
I spent a day exploring Kita-Senju and this was my first stop. A large cafe not too far from the station. Very friendly staff. Unfortunately the menu doesn't have any tea. The walnut banana bread was very good. Excellent WiFi, but I didn't really see any power outlets (at least not at the large tables).
A combined Cinnabon and Seattle's Best Coffee. Located right in front of the 1b exit at Roppongi station. The second floor is large and spacious. Use the "free_seattles" WiFi network, which is very fast (password located by the dish return area). You can definitely smell Cinnabon upstairs, but the smell isn't too overpowering.
A nice, large Verve not too far from Roppongi station. Large outdoor seating area, some seating on the 1st floor, and even more seating on the 2nd floor. I saw some power outlets on the 1st floor (not sure about the 2nd floor). The WiFi "works" but it is quite slow.
A quite large café with plenty of space available even on a Saturday morning. Great view of the street from the window seats on the second floor. Sadly the guest Wi-Fi doesn't seem to work and there are limited power outlets.
A bright, airy atmosphere with spacious interiors and large windows providing ample natural light. There's an outdoor seating area perfect for pleasant days, and a large indoor space. For working the counter seats are definitely the most comfortable.
There is fast WiFi (but limited to 3 hours per device per day). Few power outlets. From Ebisu station it is only a ~10 minute walk using the Ebisu Skywalk.
Toilets are inside the DCM DIY shop, on the same floor, but a bit far away.
This library is just a minute away from the beach. Ground floor feels ok to tak calls since the staff at the entrance are chatting anyways. Upstairs were very silent and lots of school kids studying. There are a couple of phone booth you can book.
This Starbucks is right in front of the beach and you can see the ocean from the seat inside. There are a couple of seats with outlets but not all of them. Also, the bathroom was out of service. WiFi password is just shown on the counter so easy to connect and no issue of signing in to use like they do in other countries.