This has to be the friendliest QT -- indeed, one of the friendliest gas stations -- I've ever been in. I stopped here for a cold drink recently after taking a grad school exam at the library and before heading to Phoenix.
They have several pumps, good parking, and lots of goodies inside. QTs usually seem to have more of a snack variety than some other gas stations. The folks behind the counter were really friendly -- much appreciated on a hot day when I was thirsty and brain-fried.
This location is at a busy intersection in Tempe, so be careful. As of my trip last week, there's also construction in the area.