I like to validate business idea with REAL market data now. I found it save a lot of time and uncertainty.

The best way is to use Facebook or Google ads and bring traffic to a landing page related to your Home Decor Marketplace and spend $200-$300 on ads to see the result you get. (Hint: You can target your city only with the ads for even more accuracy)

Do they engage with your ads? Do they visit your website? Do they contact or click on "Add To Cart"?

Getting real data from your target market is the best way to validate the idea you have and see if it can work in your city.

Best of luck.
Xavier