The file contains 4 sofa modules Amsterdam, which the manufacturer offers to combine with each other.
All variants of leather upholstery (BAHIA, SALTO, ESTORIL, CHESTER, YORK, SIENNA) are collected in the library of materials. Examples are on the 3rd preview.
All objects and materials have logical names in English, the materials are named according to the articles indicated on the manufacturer's website.
To change the color of the leather upholstery of the SALTO and BAHIA collections, it is enough to change the color in the Diffuse slot.
Who works in the V-Ray version is lower than 3.1. Be careful, in the materials in the BRDF section there is a Microfaset GTR (GGX), if your version is older than 3.1, then the BRDF field will be empty. Choose Blinn, Phong or Ward - which is preferable to you.
For Corona render, it is recommended to install a version not lower than 1.5, since the glossiness of materials is adjusted to fit PBR.