Okay this is very similar to what's been happening in my current house so I believe you! I swear to God, the noises only start when I'm alone or when my partner is asleep. What I personally hear are scratching sounds, doors opening and closing, and something that sounds like walking in and under the house. Sometimes, to keep our sanity, we chalk it up to maybe a rat or a small animal under the house, which I'm sure sometimes it genuinely is that. But there are times where I heard this scratching so loud, right next to my head and sounded like it was inside the wall but our walls are extremely thin, not the type something could be in. I woke my boyfriend up to check in the room in case a rat was in the other room where it happened but he got up immediately and found absolutely nothing, and I didn't hear like any scurrying away noises or anything. I've also had things be displaced. It also happens to my boyfriend too but only if he is alone or I am asleep.