As a teenager, I lived in a house with creepy goings-on. Nothing really awful-youd hear footsteps continuously between my bedroom and the bathroom, doors would open and close and once when I got scared in the middle of the night and ran downstairs to sleep there 'somebody' made my bed and cleaned my room. I took that to mean that they weren't bad ghosts and felt bad for scaring me.
Anyways, we found out later that the upstairs of the house had been moved in from another city, with the downstairs being built new on site. Which would explain why things only ever happened upstairs.