When you look at a scene, your eye and your brain interpret it and adjust to the light. They recognise all the different light sources. But a camera doesn’t. So as with so many things in life, keep it natural. Use natural light for your shots, whenever you can. And this is especially true for interior photography, it is best to use natural light alone. Nothing else will give a natural effect!
And just to be perfectly clear, and even if it may seem a little odd to an enthusiastic amateur – turn all of the other lights in the room off! If the natural light doesn’t seem strong enough, use a tripod. This totally removes movement and enables the camera to have a longer shutter opening, and pick up all of the available light, without any blurring. This is infinitely better than using the built-in flash!