He had a dishwasher when I got the household vendor. Everything else was stuff you can get in the store. Not worth wasting a vendor day on it.

in my first game house vendor had a grand piano but i didn't had enough money.

I'm doing a lot of grinding right now, just gathering up a lot of cash reserves so that when the story starts moving I'll have plenty of money.
I haven't bought a stick of furniture except a bookcase, since my mayor can't really interact with it I figure why buy it now? He can go sit on a park bench if he's tired. I want lots of money for the next update/story addition.
I'm also trying to save aquamarine, since that's how you pay the gypsy and they're intimating that she might become a useful character eventually.

Hydra, how much was the piano?
Tiger, I'm doing the same thing so I hope they update soon.