If you're interested in living like a local in a residential part of Stockholm, I would highly recommend Sonja's place. I personally consider Fredhäll to be just on the outside of what's considered "in the mix", and there are some pros and cons to this. The best parts are (1) that you will definitely feel like a local and get a very classic Stockholm experience and (2) how quiet it is: there are literally no disturbances at night and the daytime is very peaceful. However, you will not experience the density that is common in the more central parts of the city, where you can just go downstairs and there are tons of restaurant and entertainment options within minutes. Instead, you'll likely be taking the T, which is fortunately very close (within a few mins walk). But overall, this just adds to the local flavor of the experience IMO!
A note for digital nomads considering this place: the Internet is a mobile cellular hotspot, which while sufficiently fast for video calls, does have greater latency than the typical wired broadband that you see around town. My impression was that I had maybe ~100ms more latency in my conversations and slightly grainier video. If you have to do video calls for many hours a day, I'd probably consider elsewhere unless budget is a major concern. Note also that this is a one room + kitchen, so it will be hard to get physical separation from your workspace. You will either have to choose to work next to where you sleep or work where you eat, which can start dragging a bit if you do this for multiple weeks.
Overall, I still loved my stay here and rated it 5 stars on all counts. It was clean, communication was excellent, the layout and furnishings were very functional and well-kept, and the value is significant. I was able to stay here for 2 weeks for the price of 1 week somewhere more central, and if I wasn't working the whole time, I can see this being a homerun for tourists who are out and about all day anyway.