Dimensions:
Width: 57 cm
Depth: 57 cm
Height: 82 cm
Seat width: 42 cm
Seat depth: 40 cm
Seat height: 44 cm
Link to the manufacturer:
https://www.ikea.com/us/en/catalog/products/50434312/ 
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 the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable to you.
For Corona render it is recommended to put a version not lower than 1.5 since the glossiness of materials is adjusted to fit PBR.