During office hours (and earlier) there are several good coffee shops:
The Post: 70 Juta St
Mon-Fri 06h30-16h00; Sat & Holidays 08h30-14h00. 072 248 2078. Open for breakfast and lunch. They also serve good light meals. Free Wi Fi.
Father Coffee: Across the road.
Great Design and good daytime coffee.
Double Shot: Corner Juta and Melle Street
Probably has the best coffee in Braamfontein. www.doubleshot.co.za
Virgin Mobile store Mon-Sat serves a decent cup.