What is the bathroom count for "Suite 643"?
SELECT T2.bathroom_count FROM Apartment_Bookings AS T1 JOIN Apartments AS T2 ON T1.apt_id   =   T2.apt_id WHERE T2.apt_number   =   "Suite 634"
bathroom count refers to T2.bathroom_count; 'Suite 643' refers to T2.apt_number = 'Suite 634';