Apartment is in an excellent location for quick access to old town (Gamla Stan) and the newer central district just north of old town. In addition, the commuter train (pendeltåg) is accessible one block from apartment and will take you to / from Arlanda C (Airport) in 45 minutes.
However you should be aware that the apartment is part of an older complex development and therefore is showing wear and tear in some regards.
The host was good with communication and helpfully was on hand to meet us when we arrived.
As long as you are not expecting luxury accommodations then you will be pleased with the location and low key neighborhood that is still close to the city and on the subway/team (Mariatorget stop)