Today we had a little visitor. S/he came out of nowhere trough the open door to the balcony, flew over my head across the apartment and ran head first into the bedroom window. We opened the window wider and wider and evetually, with some help from us, s/he took a last turn of the room and flew out. It was a nice visit but I somehow hope s/he is not coming back, I doubt it would be good for her/his nerves.