I lived at a 7 address for 6 years and believe it was haunted. Seven is the number of spirituality.
It's also the energy of sanctuary and reprieve and the personal year 7 is definitely a slow down and a time to go inward. It was my grandma's home and I moved in after she passed away. It was still full of her stuff and I constantly felt like I was being watched. Especially in one particular room which she spent a lot of time. I had experiences in a couple of the rooms.