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Brown Dwarfs are stellar oddities. They are essentially failed stars- their mass just under the necessary threshold to indepdently support the fusion of hydrogen atoms in their core, unlike a main sequence star.
These stars definitely contradict most people's assumptions regarding normal stellar behvior. In fact it is because of their dim, barely visible, glow that they weren't discovered until 1995. They were eventually added to the H-R diagram but occupy the lowest right hand corner of the graph under the M, L, T and Y classes.
Brown Dwarfs, despite their low luminosity, are quite interesting. Their surface temperature can range from around 1000 degrees Celsius to -40 degrees Celsius, indeed assuming you found the right star (and a way to walk and breath on a star) the temperatures could be quite pleasant!
The size of these stars, as one might assume, is fairly small compared to any on the main sequence. Their mass can range from roughly that of Jupiter's to about 75 times the mass of Jupiter.
Astronomers think brown dwarfs are abundent in the universe, unfortunately for any ameteur hoping to catch a glimpse of these sub-stars they're just too dim to be easily observed.