The map makes it difficult to tell, but this is almost certainly the main Starbucks at the Desert Ridge Mall. As it happens there is also a Starbucks inside the Albertson's at one end of the mall and there are Starbucks beverages to be found inside the Barnes & Noble, but the proper Starbucks is easily found toward the movie theater end of the place.
That said, the place is fine. It's small and slightly cramped, but if you go to that mall during the day when the crowds are small then it's a decent little spot. Given that it's located in the food-court-like area of the outdoor mall, the seating possibilities are vast, even though the interior is a bit cramped.
The people were always nice, as usual. A cold Starbucks bev on a hot Phoenix summer day was not a bad way to go.