Recently I've been exploring more of the Zhongshan area in Taipei, and have found many nice cafes to work from around there. Nichi Nichi is definitely a good option if you're looking for a relaxing and quiet place to work in the afternoon, or even late into the night since they stay open until 10pm. The style is minimal and simple, but there are some nice personal touches, like the colorful hanging lamps and decorations on the walls. The soft piano/jazz background music also helps set the mood.
There's good wifi and power outlets - but be sure to arrive early if you need to charge since only some seats have access to power. The menu selection is also quite small, but the options are good. One drawback for me is that the only tea on the menu is non-caffeine, but anyways, the mint tea was very good. Be sure to try the cakes as well, the banana cake was great!
I always struggle to find workable cafes in Shinjuku. This is place is quite decent though. Look for the sign for "Sumika" and take the elevator up to the 4th floor. There are plenty of large work tables, power outlets, and fast WiFi. From 4pm they dim the lights and it turns into a cozy bar. You're still allowed to work and use your laptop in the evening. During the day time it feels a little dark and enclosed due to the lack of windows, but not a bad spot to sit and get some work done.
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.
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 huge cafe spanning four floors with power and wifi. The upper floors have small tables and large worktables. The main downside is the menu is quite small and very expensive, especially if you don't drink/appreciate expensive coffee. I asked if they had any other drinks and they had a "secret" menu with juice (which was also very expensive).
A very small cafe filled with bookshelves. The second floor is workable, but it is very compact/narrow, and the WiFi was not particularly stable. The restroom is hidden behind a bookshelf. Also the background music is quite loud, so you might find that to be a bit distracting. It's a fun spot to check out though.
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!
A small but cozy spot near Jiyugaoka station. It's located on the 3rd floor of the building with the 7-11. Take the elevator up. The space has a large work table, some small tables, and outdoor seating. Lots of natural light. There's a 2 hour time limit. I don't think there are any power outlets (at least I didn't see any).
There are many great cafes around Zhongshan MRT, but most of them get very busy, even on weekdays. Recently I discovered Cafe a la mode, which was a quiet and less busy place to spend the afternoon working from. The interior feels bright and modern, and there are plenty of seats to choose from, including one large work table suitable for larger groups. There's decent WiFi, some power outlets, and comfortable chairs. The food menu is quite large, so it's probably a good place to have lunch or dinner as well, while getting some work done!
A simple cafe near Taipei Arena. The interior and furniture is fairly ordinary, but there are some nice personal touches, like paintings, magazines, and a fish tank. It's clean and the staff was friendly. Decent WiFi, but lacking power outlets. I saw one table near the back wall that has access to power. Nice drinks selection and the food options seem pretty good as well, so it might be a good cafe to have lunch at.