@foreach($authUser->reviews as $review)
   <p>{{ $review->body }} - {{$review->from_user }}</p>
 @endforeach

class User extends Model implements AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword, Messagable;

    protected $table = 'users';

    protected $fillable = ['name', 'email', 'password', 'firstname', 'lastname', 'straat', 'postcode', 'plaats', 'provincie', 'role', 'specialisatie'];

    protected $hidden = ['password', 'remember_token'];

    public function projects()
    {
        return $this->hasMany('AppProject');
    }

    public function reviews()
    {
        return $this->hasMany('AppReview');
    }

    public function comments()
    {
        return $this->hasMany('AppComment');
    }
}

<?php

namespace App;

use IlluminateDatabaseEloquentModel;

class Review extends Model
{
    protected $guarded = [];

    protected $table = 'reviews';

    public function User()
    {
        return $this->belongsTo('AppUser');
    }
}

<?php

namespace App;

use IlluminateDatabaseEloquentModel;

class Review extends Model
{
    protected $guarded = [];

    protected $table = 'reviews';

    public function user()
    {
       return $this->belongsTo('AppUser', 'from_user');
    }
}

@foreach($authUser->reviews as $review)
   <p>{{ $review->body }} - {{ $review->user->name }}</p>
 @endforeach