Well, I'm not aware of other sites for furniture and/or antiques that accept bitcoin as a payment method.
But, bitpremier seems like a pretty good one to me. Didn't you find what you were looking for there?
Well, I've browsed through their site a couple months back, and it was pretty good, they got a lot of premium products.
Only thing is, their products are quite pricey. I guess when they say Luxury, they really mean it.
Anyway, you're looking for antiques, you'd be better off buying from physical antique shops. I don't think there are other ones like bitpremier yet.