Giving it a solid three stars!
Maybe my scale is off because I just recently moved from the Bay Area to Phoenix but you gotta blow me away to get five stars. On a grading scale I view a 3 as a B, a 4 as an A and 5 as an A+. Now that I've level-set where I am coming from I can get in to the review.
I stopped in to One Coffee to wait for a friend to meet me. It was a weekday morning and very quiet inside. There were a couple ladies working behind the counter. I tried ordering a coffee drink similar to something I am used to ordering at Starbucks and got a bit of an attitude. Ok, I get it, corporate giant - independent coffee shop, so I let that go. I ordered a drink and a panini sandwich and went to find a table to work on my laptop. My sandwich was delivered to my table and it was pretty good - pesto on focaccia (I've noticed that Phoenix has a thing for focaccia), coffee drink was great, a little too sweet for my taste but I did order a sweet drink. The coffee flavor itself was great.
They were playing some progressive punk station on Pandora and the commercials kept coming on which was weird and took away from the vibe they were trying to create (Tip: Pay the $36 a year for no ads or get a DMX box)
All in all a good shop but I noticed due to its location you cannot really drive to it without having to look for parking. Good if you are in the area on foot and want to stop in for a coffee.