A great place for both indoor and outdoor working. The cafe is a popular spot for studying and working, but it is large so you can still find a seat most of the time. Fast WiFi, but power outlets are a bit difficult to find. I would say the biggest downside is that they close quite early.
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 cafe with delicious pastries and comfy counter seats. The WiFi was a bit slow, but still usable. I was able to take a call as well without much issues.
The cafe is very spacious but lacks seats for people who are alone. I felt bad for occupying the whole table for four seats. Anyhow, despite the google maps reviews saying that the WiFi is bad, I didn't have much problem at all. I ran a few speedtests and the fastest it recorded was 180 Mbps. However, there were some tests that scored around 30 Mbps, so I have to say it wasn't consistent. The music is really quiet. There are a few outdoor seatings for the smokers as well. Power outlets, you gotta find a good seat that's close to it.
A nice cafe near Seolleung station. The interior is quite spacious with plenty of natural light. Very fast WiFi and lots of power outlets. Usually not too busy, although it fills up a bit around lunch time. The only downside is that the nearest restroom is in the office building two doors down, which is a little inconvenient.
This library has plenty of seats and outlets to choose from. There are quite a few people working with their laptops open so seems like a normal thing to do. Wifi is not the fastest but stable. One thing that was annoying is that they probably block ports other than 80 or 443, so you can't SSH, connect to Postgresql DB, connecting to VPN, etc. For taking calls, if you go towards the kids area, you might feel more comfortable talking since there are kids who are also loud. However, there are signs that says no loud talking on the phone so not the best place when you have a day full of meetings. The out door benches are also available and the wifi speed doesn't drop too much even if you're seated outside. There's a supermarket right next to it so you can go grab some drinks if you need any. Edit - I could bypass the restriction by using Obfuscated Servers with Open VPN (TCP) protocol on NordVPN.
中正紀念堂附近有這麼一家時尚而舒適的Cafe，很早就開門了（７：３０），很適合晨型人，餐點種類很豐富，不用擔心工作到一半餓肚子。如果要和三五好友一起來，記得提早一點才能佔到工作桌，我自己喜歡選擇牆邊有插座的吧台型座位，儘管檯面有點窄不太適合使用筆電，充電也需要拿開檯燈的插頭。
這裡通常滿熱鬧的，所以店員有可能會“建議“只能待三個小時（視情況而定）
淡水長堤咖啡餐館在淡水河畔上，空間非常寬敞，一樓有室內和室外的位置，二樓也有很大的天台包含有屋頂遮蔽的位置提供很好的淡水河視野，天氣好的時候可以在這裡看夕陽，樓上的天台要到下午才會開放（不是很確定是不是總是如此）
平日下午滿安靜的，但傍晚開始會越來越多人。這裡有非常多種類的餐點和飲料。WiFi不錯也有很多插座。
三創育成咖啡Star Rocket在三創11樓，因為地點方便，座位很多（如果第一次來，需要先找到大門右邊方向的電梯，上11樓後跟隨指示就可以找到)，平日也通常滿安靜的，整體來說還算適合工作，尤其是剛好在附近的。大的工作桌座位很舒適，同時也能點到一些基本的食物和飲料。可以跟店員借延長線。
小缺點是Wifi 滿慢的也容易斷，然後營業時間並不長，算是應急用工作場所。