I have spent one night at Ewa's lovely apartment and I can say that I am totally satisfied with my stay.
I was welcomed friendly and nicely upon my arrival, even though I have arrived around 1hour later than requested due to the concert being delayed. Also, I have received clear instructions on how to reach Ewa's apartment and how to get to the Arlanda's airport, which was very nice.
In general, the communication and the whole expierence was very smooth and pleasant. Recommended. :)