Use a wide angle lens. Shooting wide can make the room look great, especially when in Hong Kong, the size of the property is most likely less than 100 sq. meters. In a confined space, sitting tight into one corner while you try to get the other three corners in just looks wrong. You shouldn’t shoot all three walls into one picture. Showing the highlights of the interior design features is important. About the lens, anything in the 16-24mm range on full frame (or the APS-C equivalent which equates to 10-16mm approx. on some less expensive camera) is great. I often use 17mm full frame for my wide interior work.
Sufficient indoor and natural lighting are both important. Light up the room. If there is good natural light coming through the windows, use that as well. Adjust the overall feeling of the lighting to a balanced and optimized level.
Find the best angle. Take time to explore different angles to shoot from. Decorate the room with small artistic items, plants or anything you like to add a bit of creativity. We can’t all afford a tilt-shift lens to keep perspective in check, so it’s a really