Keep save-game values inside a dedicated serializable class.

[System.Serializable]
public class SaveData
{
    public int version = 1;

    public int coins;
    public int level;

    public float positionX;
    public float positionY;
    public float positionZ;

    public string scene;
}

Restore position:

transform.position =
    new Vector3(
        data.positionX,
        data.positionY,
        data.positionZ
    );