Certainly the biggest factor is the dynamic range processing. The room is so bright, and shares the same color temperature as the outdoors daylight lighting. Yet the shadows in the balcony and near the glass door, which are closer to the light source, are the darkest parts of the scene.

Also, one "fakeness" indicator that your mind might not have caught, but your eye did, is the scene in the mirror. The few parts of the sky in the mirror are clearly blown out white, but the sky visible directly through the window is a nice sky blue. An interior even partially that bright would have a blown out sky, if not also more of the general light-colored scene outside the window. For instance, the "tent" pavillion (that looks like a mini version of Denver's airport) is completely blown out.

Good architectural / real estate shots are hard. This is one of the better something's-not-quite-right ones (as opposed to the surrealist crank-the-hdr-to-eleven ones that are more typical).

Try to imagine how this can be improved by controlling the outdoor lighting — either early in the morning, or late in the evening. The light level outside would be brought way down, and provide dynamic shadows on the buildings. That would allow for better control of the indoor lighting (whether by longer exposure from natural light, or with use of artificial lighting from the table lamp or via flashes).