This answer contains spoilers to The Dark Elf trilogy, the story of Drizzt Do'Urden. Rather than hiding everything behind spoiler tags, just avoid reading this answer if you have not yet read the over two decades old story.
Drizzt saw every sight in the deep gnome city as a contrast to
Menzoberranzan. The dark elves had worked the great cavern of their
city into shaped artwork, undeniably beautiful. The deep gnome city,
too, was beautiful, but its features remained the natural traits of
the stone. Where the drow had taken their cavern as their own, cutting
it to their designs and tastes, the svirfnebli had fitted themselves
into the native designs of their complex.
Menzoberranzan held a vastness, with a ceiling up beyond sight, that
Blingdenstone could not approach. The drow city was a series of
individual family castles, each a closed fortress and a house unto
itself. In the deep gnome city was a general sense of home, as if the
entire complex within the mammoth stone-and-metal doors was a singular
structure, a community shelter from the ever-present dangers of the
Underdark.
The angles of the svirfneblin city, too, were different. Like the
features of the diminutive race, Blingdenstone's buttresses and tiers
were rounded, smooth, and gracefully curving.
It continues:
Tucked away in a remote corner of one of the outer chambers sat
Belwar's dwelling, a tiny structure of stone built around the opening
of an even smaller cave. Unlike most of the open-faced svirfneblin
dwellings, Belwar's house had a front door.
A little later:
The inside of Belwar's house was sparsely furnished with a stone table
and a single stool, several shelves of pots and jugs, and a fire pit
with an iron cooking grate. Beyond the rough-hewn entrance to the back
room, the room within the small cave, was the deep gnome's sleeping
quarters, empty except for a hammock strung from wall to wall.
Source: The Dark Elf Trilogy, Book Two: Exile; Chapter 7
I think these passages are probably some of the best descriptions that I, at least, know of. I bolded the most relevant lines that described what you were looking for.
Chapters 2 and 4 of the same book include some descriptions of the outside entrance to Blingdenstone, and chapter 6 includes a more lengthy description of the inside of the entrance to the city. (Chapter 6 by far is the best additional description of the city, the other two chapters just contain relatively short descriptions of the outside of the gates.)
I recommended reading the entire trilogy, if you haven't already. It is a fairly quick/easy read (I re-read it myself in just a few days a couple months ago.)
