friendly ghost?

I have had experiences with ghosts. My grandmother after she passed was in my grandfathers house. My husband and I stayed with him for some time and when we first moved in, I would wake up to sounds in the kitchen and I could smell coffee brewing. I thought it was my grandfather as I walked down the hall and into the kitchen, but all the lights were off. She always made coffee at 5 a.m. in the morning when she was alive. I walked into the kitchen for the first time and there was nothing, no lights on and no one in the kitchen. So I went back to bed thinking I was crazy. I asked my grandfather about it and he said it was Nana and that she was still here with us. It didn't bother me after that, because I loved my Nana very much and missed her, so it was kind of comforting to know that she was still there in spirit.