Savassi is an area in the nicer part of the city.  It is the name of a plaza and a popular place for people to hang out.  There are many good and fun restraunts in this area, one includes McDonalds.  This area is about 1block from the mission office.  

This is a map of the Savassi area, at the bottom of the page, where Av. Cristovão Colombo and Av. Getúlio Vargas cross is the big hang out area, and also where McDonalds is.  The mission office