1. Stand in the corner. A photograph taken from the corner of the room is usually the best view. Squeeze yourself as far back into the corner as you can and your camera should be looking towards the key features of the room e.g the fire place or a window. An alternative is to stand in a doorway of even just outside of the room with your camera positioned in the doorway
2. Use additional lighting with caution! As a rule of thumb: turn on table and reading lamps but leave the overhead lights off. Table lamps add warm spots, but large, bright overhead lights are often glaring and distracting. Small recessed overhead lights can be ok to leave on, just take a trial shot with both the lights on and off and see if they detract from the features you want to show. If the lights are on a dimmer switch then turn them onto a dim setting.
3. Look all around the frame. It is very easy to miss little things that will spoil your photograph. Look carefully all round the frame of the photo. Are there any untidy wires, or bins or unsightly objects that you could move?
4. Use a tripod. Vertical lines should appear vertical and not converge. Using a tripod will keep your camera level and avoid lines or walls looking strange because the camera is being held at an angle. It will also help you avoid any camera shake which will blur your photos. Position the height of the camera somewhere around chest height, approximately 5 feet or 1.5m above the floor level.
5. Use camera settings to give you a good depth of field. You want everything in your photograph to be in focus. An aperture setting of F8 is a good compromise. Be aware that your shutter speeds will be long, they maybe up to 1 or 2 seconds in dark rooms so it will not be possible to hand hold your camera.