This sofa is modeled according to existing, real-world furniture, which you can find on: www.archiproducts.com

The cushions have a procedural velvet material, which color variation is changeable, and the supporting construction with legs has a painted metallic material.

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

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