7.00 am in Amsterdam - you will be awfully lonely at that time of day; shops don't open until around 10.00 am, though the canal cruise boats (I believe) start at 8.00 am - and are full of blearly-eyed tourists too! But you can set your self up with an excellent coffee - even breakfast if you like - at the 1st.
Klas restaurant on platform 2 of the station; its a very good ...