my family [ 4 adults ] will transfer to osaka from tokyo by train on april. please give me detailed direction from hotel sunroute shinjuku to dotonbori hotel in osaka. i know there are lots of train lines in japan and different train categories and it gets so confusing everytime i read about them. that's why i want to ask for your personal advise regarding this. by the way, all 4 of us have 1 big luggage each. thank you.