Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE staff ( staff_id number, gender text, first_name text, last_name text, email_address text, phone_number text )
TABLE: CREATE TABLE customers ( customer_id number, customer_type_code text, address_line_1 text, address_line_2 text, town_city text, state text, email_address text, phone_number text )
TABLE: CREATE TABLE complaints ( complaint_id number, product_id number, customer_id number, complaint_outcome_code text, complaint_status_code text, complaint_type_code text, date_complaint_raised time, date_complaint_closed time, staff_id number )
TABLE: CREATE TABLE products ( product_id number, parent_product_id number, product_category_code text, date_product_first_available time, date_product_discontinued time, product_name text, product_description text, product_price number )

### Question ###
Which city has the least number of customers whose type code is 'Good Credit Rating'?

### Accurate SQL ###

SELECT town_city FROM customers WHERE customer_type_code = "Good Credit Rating" GROUP BY town_city ORDER BY COUNT(*) LIMIT 1