I'm renting out my studio apartment in the heart of Hornstull.
It's super cosy. You can definitely sleep two here, but if you're friends I've got a mattress that we can set up, if needed.
The flat is located in the coolest part of Stockholm, just by the sea. There are a lot of great restaurants in the neighborhood, such as Tjoget, Barbro and Käk. You can go and have a nice full on breakfast at Vurma or just an organic juice at the specialized place, Juiceverket. There is also a small theatre around the corner. Here you can view great indie films and have a "fika".
When travelling around the city it will be easy for you. The red metro line stops here, as well as bus nr 4 and 40. If you like walking you can stroll by the sea to either Kungsholmen or continue from the house to another part of Södermalm.