What are the id and first name of the student whose addresses have the highest average monthly rental?
SELECT T1.student_id ,  T2.first_name FROM Student_Addresses AS T1 JOIN Students AS T2 ON T1.student_id  =  T2.student_id GROUP BY T1.student_id ORDER BY AVG(monthly_rental) DESC LIMIT 1
SELECT T1.student_id ,  T2.first_name FROM Student_Addresses AS T1 JOIN Students AS T2 ON T1.student_id  =  T2.student_id GROUP BY T1.student_id ORDER BY AVG(monthly_rental) DESC LIMIT 1
[{'student_id': 3, 'first_name': 'Rhea'}]