I have to say a big thank you for the warm welcome that I received.
I stayed almost one month and this was one of the best experience with airbnb. The location is awesome, 2 minutes from Karlberg station and 10 from St Eriksplan, the room is spacious with a lovely balcony, I had my private bathroom and at the end Christian and family are very friendly, they helped me a lot during my winter experience in Sweden.
They also speak Italian so I found a small piece of Italy in Stockholm.
Great experience!