The apartment is nice and cozy and has everything you need. The bed is 120 cm and works for a couple who likes to sleep close. We were given towels and coffee and tee, which was a nice gesture. Viveka is the perfect hostess! She met us at the train station and gave us the key, and let us keep our luggage in the apartment until we left for the airport Sunday evening. She also checked in on us by sms during our stay to see if we needed something.
The apartment is a 5 minutes walk from the subway station, and it takes about 8 minutes to Södermalm and 13 minutes to Gamla Stan. So it's not super central, but not far away either. I would have like to stay a little closer to the city center, but we had a great stay, and would absolutely recommend Viveka's apartment.