We stayed for a month and a half in Matt's apartment in Kungsholmen. The location is absolutely fantastic; you are in the city center within 15 minutes with PT, and all the necessary facilities (shops, supermarkets, gyms, bars) are within 4 minutes of walking.
The apartment itself had all that we needed. It is somewhat on the smaller side, but we did not experience this to be much a problem despite staying there for a longer period of time.
Matt checked us in personally and showed us around the apartment. We received quick and helpful response to the few questions we asked him.
All in all, we are very satisfied with our stay and would recommend this apartment to others.