Mama Java's feels like it belongs in a small college town. The three times I've been here the clientele has been younger, relaxed, and friendly. As are the employees.
The only reason I'm not giving Mama Java's five stars is because the only thing I've tried is their house coffee, which is very good.
This is one of the coffee houses in central Phoenix where I can be pretty confident of finding an empty seat next to an electrical outlet to take advantage of their free wireless. Although they do have live music that at times fills the front of the house, there is a separate area in the back with bar-style seating and seating for about a dozen. There's a pretty good chance I can get some work done at Mama Java's anytime.