Quetta is one of the most visited places in Pakistan. People are highly friendly and hospitable. There is alot to have fun in mountainous valley of Quetta and adjoining areas. Summer is very suitable for visit, whereas winters are partially cold but pretty enjoyable while snowing. Highly cheap to live from 10-20 USD in a good hotel and 10-20 pretty good meal of entire day. So best of luck.
Sajji, Rosh, and beautiful Serena