It could be confirmation bias for any new people to the place, that is because it may look spooky they believe any little thing is a ghost. You on the other hand have got used to the small natural sounds.
But it is still possible a spirit has accepted you as the owner and sees others as intruders. I had a spirit that was friendly to me but disliked my new partner. He possessed a stereo, and would greet me with music whatever time I came home, but when my new partner tried to play her music it would not accept the CD's - not by her or by me., and even spat one out (which was not possible on this radio). After that it behaved oddly, and eventually woke me p at full volume at 4AM and would not turn off without unplugging the thing. I thought that would stop it, but he moved onto leaving answerphone messages - that originated from my house when I was out!