This is an office building but the ground floor is usually open for public. Inside the building, there is a small lobby area where there are seats and plugs under the benches on the wall. Also, if you go outside, there are standing "desks" with power sockets as well. There is a Kanda Square public WiFi which is not the fastest but usually gets the job done. If you need any drinks or food, the building has a Lawson, Summit (supermarket), and Tully's + a few more dine-in restaurants. I see the lounge area in the picture is quite popular and seats are almost full by 10AM.

I think the building itself is open 24 hours but not sure if they allow work in the lobby late at night. I've exited entered the building quite late at night though. Outside plug is definitely open 24/7 🤣 Bathroom is definitely super clean, and there's a smoking room on the ground floor if you need one 🚬

This Tully's is located on the 3rd floor of the LaQua department store. If you happen to be in the area, it's a good spot to get some work done. I especially like the counter seats by the windows. You can access the cafe in the early morning (before the department store opens). There is a time-limit, but I'm not sure how strictly it is enforced (I usually don't stay for more than 1.5 hours anyways).

Quite a nice place, but it's very pricey for what it is, and there was a 1.5 hour time limit on weekends (not sure about weekdays). Quite a large outdoor seating area (pets allowed). I ordered a muffin, which wasn't really worth the price (quite dry). There are no restrooms inside the cafe, you have to go out, and then take the escalator up to the second floor, which is quite inconvenient.

A fantastic cafe for working near Takadanobaba station. The 2nd floor is best for working, so when you arrive, let the staff know that you'd like a seat on the 2nd floor, and they'll give you a seat number and a QR code for ordering.

Drinks are quiet basic, and a little pricey for what you get, but at least the space is very comfortable, great for a work or study session.

Two restrooms available, one on 1F and one on 3F.

This cafe is on a small quiet street near Shin-Okubo station. It's calm, quiet and cozy, even on a Sunday. I believe the owner might be from Taiwan, and they serve Taiwanese Oolong tea, which was very nice. There's good WiFi and power outlets. They don't accept cards though, so be sure to have cash or PayPay.

One of my favorite spots near Yoyogi station for a quick work session. The interior is small but they have some seats that allow you to use your laptop for up to 90 minutes, which is fair. The coffee is good, and the cakes are really good. Unfortunately no tea available.

A large and spacious cafe near Harajuku station. Surprisingly not very crowded considering the area, but I guess the vibe is a bit "corporate-y" so it's probably not the most popular cafe for tourists. In any case, it's a great spot to sit and get some done. Fast wifi, and especially the counter seats are great if you need power.

A small and cozy coffee shop near Ginza station. There are counter style seats and some small tables (really only suitable for 1 person per table). The counter seats have power. Menu selection is quite small. There's coffee, but no regular caffine tea (only herbal or tea latte). The cookies are really good!