The apartment is absolutely incredible, and I cannot recommend it highly enough. The location is perfect, right in the heart of old town, and a twenty minute walk from the airport train. The amenities are excellent, including a fully equipped kitchenette that even has a small dishwasher. The bed was incredibly comfortable, and the place itself looks great. On top of that the staff were very friendly and helpful, waiting for us as we were arriving late, and providing many good recommendations of things to do and places to visit, which we can now also highly recommend.
Overall, I cannot recommend the host and apartment enough, and would definitely suggest you stay there if you're looking for an excellent Airbnb in Stockholm! 10/10 for everything!