My last house had a ghost as well. I saw it the first night I lived in the house, although it wasn't my first sighting of a ghost, I slept on the sofa that first night. The next morning when I got up, I opened the door to the second floor and yelled up the stairs "Okay now, listen up, I own this house now and I am not leaving, if you wish to stay, it is okay with me." Over the years I lived in that house, I was frequently comforted by the ghost.
There also appeared to be a portal of some kind in the house, it would briefly open periodically. I always thought I had imagined it until one night a friend of mine saw it as well. I never felt fear or threatened in that house -- just peace.