List the top five cities in terms of the number of 5-star ratings in 2016 reviews, in descending order.
5-star rating refers to Stars = 5; in 2016 refers to Date like '2016%'; most reviews refers to max(count(city))
SELECT T2.city FROM reviews AS T1 INNER JOIN district AS T2 ON T1.district_id = T2.district_id WHERE T1.Stars = 5 AND T1.Date LIKE '2016%' ORDER BY T1.Date DESC LIMIT 5