I have the same headset and walk around my 60 square metre flat all the time and make calls with it without any problems. But as already mentioned, it depends on the resistance that the Bluetooth connection has to overcome.

The only thing that bothers me is when sitting down or lying down. The wheel for adjusting the volume is on the left rear of the headphones, so it can happen that the volume adjusts slightly if you move carelessly.

In a flat on the same floor, this usually works very well with brick walls, but it's difficult with concrete walls.

A few metres is enough distance, but it depends on the thickness of the walls. Sometimes it comes back.

yes, you can even change floors. but if there are too many walls in between, it is no longer possible.