This is purely a question of the volume setting and the position of the subwoofer in the room. As far away as possible from the wall shared with the neighbour.

This is solely a question of the volume setting and the positioning of the subwoofer in the room.

Well, that depends on the dimensions of the room and only to a limited extent on the volume and certainly not on the positioning in the room (bass sound spreads out "spherically") The problem is with the so-called "standing waves", i.e. frequencies whose wavelength is equal to/multiple of the room axes. These standing waves put the walls into an "oscillation state" and it also depends on where you are in the room, as cancellations of waves are also possible and you don't hear the bass energy at all.