We enjoyed our stay at Joakim's place. As a frequent traveler and Airbnb user, I have to say it wasn't our favorite place we have stayed, but there were many good things about the flat. I will list a few pros and cons for those considering this place.
Pros:
1. Joakim is incredibly nice and responsive. I really enjoyed meeting his parents when they let us in.
2. The flat is located in a great area! Right near the train station and in walking distance to most of the "key" sights. The restaurant scene near his apartment was great too. As a parent traveling with a young child, the proximity to the train (and a few playgrounds) was really nice for us. There is a grocery store in walking distance.
3. The place was clean, bright, and well appointed. The main bed was very comfortable.
4. There is laundry in the basement of the building (there is a washer in his unit, but it was broken at the time, so we used the basement one - he told us of this problem before arriving).
Cons:
1. As other mentioned, you do have to climb 4 flights of stairs to get to the unit. Not a huge issue, but you should be aware going in.
2. We found the place, while nicely decorated, to be a bit sparse. It didn't bother us that much, but it wasn't super comfy to hang around at night on the couch. If you are using this mostly as a sleeping pad, I don't think it matters that much, but due to having our kid, we spent nights in the living room and would have like a bit more comfort. The kitchen was also bare when it came to cooking items. We could also have benefited from more towels.
3. We were very happy with the extra mattress Joakim set up for our daughter! However, it would have been thin for an adult, so ask about that if you are counting on having three people stay.
4. You can hear the fireworks from Tivoli. You can kind of see them if you crane your neck on the porch, but you can clearly hear them and as a light sleeper, I woke up.
Summary:
I think this is a nice place, especially for the price. If you are a single or a couple traveling and don't need a lot - just a jumping off pad - this place will work great for you. If you are looking for a place where you can hangout, cook and relax at night, I might suggest something else.