There are 4 sets of curtains with materials in the scene, as indicated in the preview. Also window model, moldings, parquet.
Turn on TurboSmooth on all elements.
Similar models:
https://3dsky.org/3dmodels/show/nabor_porter_87 
https://3dsky.org/3dmodels/show/nabor_porter_68 
https://3dsky.org/3dmodels/show/nabor_porter_62 
https://3dsky.org/3dmodels/show/portera_v_sovremennom_stile_11 
https://3dsky.org/3dmodels/show/portera_v_sovremennom_stile_10 
https://3dsky.org/3dmodels/show/portera_v_sovremennom_stile_9