I do not have any stats either, and at Sims fandom it also shows it as blank.
But Hygien goes up by one arrow, and Fun by three. And according to this guide:
http://www.carls-sims-4-guide.com/forum/index.php?topic=1158.0
the environment stats would be 9:
I placed it in a empty room which gave a Decorated moodlet; added a painting with +5 which gave Nicely Decorated; exchanged that for two paintings with +10, which gave Beautifully Decorated. :smile:
(Edit: Thanks to @starguru for the tip about the guide in another of your threads)