The apartment is in the heart of Gamla Stan, the Stockholm 'Old Town' which is really nice and you will enjoy wandering the streets nearby. The apartment itself is also very nice and quite cozy. It is best for 4-6 people, but even with 7 it works fine provided you are all family or good friends and dont mind sleeping in shared spaces.
Communication with the host was not great. I sent messages prior to the check-in date which were acknowledged after several days or not at all. Not a big issue, but compared to other hosts it was disappointing. Similarly, when we checked in there was only bedding, towels etc for 4 people even though the booking was for 7. We called the host (which appears to be a nearby hotel) and they came to fix it. So it was resolved quickly but was a bit confusing at first.
Overall the stay was fine since we didn't spend much time in the apartment anyway and just slept there. But I would think of this place as more of a serviced hotel apartment room with basic supplies than a typical Airbnb.