Yes it's better to have a reservation
Yes it is a good idea to book
If you want to..they are extremely accommodating. We walked in and they asked if we had a reservation, which we didn't but they still managed to find us a table.
Yes or a little earlier.
In Hanoi you dine early
Place is busy. Reservations recommended
Thank you I might book to be on the safe side
Get quick answers from The Gourmet Corner Restaurant staff and past visitors.