I'm not 100% on this but, with that said, if you are in a guild, and you're guild hits a certain level, certain incentives start opening up, like a horse, or certain furniture, OR crafting stations. I originally thought that these would be placed in guild halls once those were available but soo far I've read or seen nothing pertaining to a guild hall ever opening up or even a place to put them. So I guess people are putting them into their homes instead. They can be purchased with coin, status points (gotten from writs), or maybe combo of both.
From who, I have no idea.. ask the guy who had one in his house.