Sofa Antique Ebony is modeled according to existing, real-world furniture, which you can find on: www.houzz.com

The whole sofa has a black leather material, whose color is changeable if you put the overlay factor in shader editor on 1.

The leg construction has a black metallic material.

The whole model is not joined in one mesh. It contains several parts, which are parented to an empty object.

Just mark an empty object, and snap your whole model where you want.