If you're looking for a place that is literally right in the center of almost everything, this is the place for you. The flat is very close to a main subway station and is also very near a main bus stop. There are numerous shops, cafes and restaurants of all sorts within walking distance from the flat. Also easily accessible to the flat was Gamla Stan and other parts of the hip Sodermalm neighborhood.
The flat itself is very nice. Spacious, comfortable and well apportioned if you wanted to stock it with some groceries from the nearby Coop store. The place is conveniently located a street over from a subway stop, which is only two stops from the Central Station, and is really quiet. Even though you are only a block away from a busy street, the traffic on the street outside the flat was virtually non-existent. There is also a balcony, which would be great to use when the weather is a bit warmer. We were there in January, so no hanging out on the balcony, but the flat was warm and comfortable the whole time and I never had to fool with a thermostat. The flat is on the third floor, but there is a spacious elevator, so don't worry about having to lug bags up the stairs.
I did have one issue while we were there (blew a fuse charging too many devices I think) and Nina responded quickly with a solution.
I wouldn't hesitate for a minute to book this flat again if I am back in Stockholm.