Wow, such a great topic. Now i will try my first post:)

The use of crytals for energetic cleansing interests me for a while now and through my family i got to know 'angel stones'which a lady in southern Germany produces and which are unbelievably nice for an appartment (link in german). With eyes closed it feels like a huge white bulb of angelic energy, very comforting and enhancing the atmosphere.

https://www.sumareni.de/home/tipp/herzchakra-engel/

A nice side effect there is that you are also covering have of your neighbourhood:)

A mountain crystal placed near the wall which is facing the neighbours flat will give some additional protection. Mostly we are not aware that somebody else mit be sleeping just a meter away from us and we don't notice as there is a wall in between - another point to consider sleeping with your head to the center of the room.

Many greetings from Mali,
Thomas