HDR (High Dynamic Range) is great, don’t get me wrong, but it should not be used in interiors photography unless you’re extremely talented. Very few people can pull off a natural and pleasing look using it. If you’re resistant to using external lighting such as speedlights or strobes in a home then at least use Exposure Fusion instead. It uses a Low Dynamic Range algorithm to layer several different exposures and makes a much cleaner image than HDR.
I’m a huge fan of using HDR for instances where you’re not trying to make the scene look identical to what you see in real life. Landscapes and Cityscapes are great examples of when to use HDR with a light hand.