We (2 adults, 2 kids) spent 10 nights in Stockholm, and this apartment was perfect for us. Communication and instructions were great making check-in seamless. I would definitely stay in this apartment again. The location is perfect. It's a short walk to Gamla Stan and the Slussen metro station.
The apartment is well appointed with lots of natural light. On a sunny day you almost don't need any electric lighting at all. The building itself is very old, and some of the old structural beams haven been left exposed giving the place a sort of modern industrial feel.
Highly recommended.