The only place I would stay in while in Kalimpong. This is a rather heavily biased opinion though; part of the blame lies on the warm Binod Uncle, the man who runs Cloud Nine. Part of the blame on Mona didi who looks after the rooms, and can also whip up a mean scrambled eggs on toast.
If you want creature comforts like an AC, room service etc then look elsewhere. However if you want to stay in a place that feels like home, than this is the place to be.
Location - bit of a stroll from the taxi stand but closer to durpin gompa, which is nice for a morning walk.