If you need a cozy place in the heart of Stockholm I can definitely recommend Elsas place. Centrally located but really quite neighborhood at the same time. My girlfriend and I spent 5 days around New Years at Elsa's and felt really comfortable, had everything we needed, with only few minutes walking distance to the next metro station, supermarket, or restaurant. Unfortunately had no chance to meet Elsa in person but she gave us detailed information on how to find her appartment, check-in, etc. We had no trouble at all.