On sims3 times it was possible to add a black piano finish in top surfaces. But on sims4 seems it doesn’t work. We spent hours trying to add a top horizontal reflective surface but nothing we tried so far worked. Reflective finish only works in vertical (like we did in our Serene hues dresser doors). So, we made some adjustments on diffuses and specular, making the surfaces somewhat reflective but taking care to not having them with a fake finish.
Hope you still enjoy this room although it is not equal of sims3 version.
Recoloring Allowed: Yes – Do not include mesh
Creating Tool used: TSR Workshop