Manufactured doll house furnishings of this era, were often made in Germany as were the little dolls. I had a dear friend of German origin bring her childhood collection over to me to help her sell. She is in excess of 90 years old, a delightful lady who still teaches piano, runs her own household, and dresses her dolls. She had a story to tell about every piece of furniture, and remembers hours spent with her sister in creating the tiny little bed linens, doll clothes and lampshades. I like to think there are similar stories about every antique piece that comes my way.
Also of importance to me is for miniatures to be made of the material they are in real life.
If a bed is representing one made of wood, I cannot tolerate it in plastic. (sorry Chrysenbon) If bathroom fixtures are representing porcelain pieces, then do not make them in wood! Realism is very important in my own collections.
Some enthusiasts enjoy making all of their own furnishings and accessories, even their own dolls. This exacting craft can only be admired by those of us less talented, but certainly makes their fascination obvious.
Some crafters make such exquisite pieces that the prices can command as much as their full size counterparts. There are miniature artists, who paint on tiny canvases each work of art is a one of a kind painting. Other artists paint on tiny plates, even buttons as canvases.
There are miniature artists who do miniature needlepoint, knitting, rug making and pottery as well as wood workers.
One thing I have found is once someone embraces this hobby, it is usually a life long obsession.