How do you know if your description strikes the right balance?
The issue is quite nuanced. Different genres require different details, as do different audiences, different purposes, different voices, and so on, so I can't offer a one-size-fits-all answer.
Start with crystal clarity on your intention.
Do your details have a clear purpose to enhance reader engagement or clarify tone? Do they paint a solid image or evoke a specific emotion? Or do they just kind of fill the space with dust-collecting knick-knacks? Are they vague or do they hold valuable, necessary meaning?
I like to imagine a typical hotel room. The furnishings and framed art fall into one of two camps: strictly functional or strictly decorative.
Contrast this with your favorite room at home. You've chosen the mattress, the sheets, the covers and pillows, the frame — all to provide the best night's sleep possible for you. The art you've hung is similarly meaningful, not just clutter. Maybe you purchased a painting at an art fair because it reminded you of the meadow outside your grandmother's house, or maybe you have family photos prominently displayed?
Hotels are generic. Even the most luxurious places are not designed to be memorable in the details in and of themselves. But our homes are. That's intention.
If the words in your writing are hotel rooms, they are probably fluff. If they are the narrative's "home," they are probably vivid detail.