I tried that, I coulda swore he didn't sell me anything else but maybe I just wasn't paying enough attention. I'll try him again in a bit when i'm not over encumbered :/
There is a stupid . . .
CONDITION . . . that has to be met for him to sell you furniture for your house. Namely, he MUST be in the throne room with the Jarl or the option won't show up in his dialogue. I don't know if it is a bug or not, but it's pretty stupid and confused me to.
Also, when you first buy the house it does have 2 beds. One is for your servant, hence, why it says 'owned'. The other is over in the corner and you can sleep on it.