You can go to the terrace of Juan Ranas without booking, no problem.

Opening hours; 13.00 to 00.00

You can also make a reservation;
Reservations on the terrace are conditional on a minimum consumption of
50 euros per person.

When booking you will have to accept a cancellation policy and give a credit card number.
and provide a credit card number to back up your booking.

In the event of a no-show or failure to give 24 hours notice,
a charge of 30 euros per person will be made.

You may request a table in the front row,
at an additional cost of 10 euros per person.