You can't see this coffee shop from the street, as it's located at Walton on the Chattahoochee apartment complex, but buzz in and say "coffee" and they'll let you in. Only open to non-residents during the week, Chattahoochee Coffee Company stays busy with a steady influx of in-the-know locals. They're not open to the public on weekends to make themselves available to residents and parking is scarce most days either way.
But once you've reached suburban coffee nirvana, you'll want to stay. They serve Counter Culture coffee and Rishi Tea with pastries and smoothies.
There's plenty of seating, both inside and outside, and access to plugs and free WiFi. They also have computers for use. Grab your beverage of choice and walk down to the benches next to the river.