Food4Thought restaurant in Chiang Mai offers wonderful sandwiches, with great service and atmosphere.
People also use the wifi to spend the day working or surfing with good drinks and food available whenever the mood strikes you.
The sign in the photo shows text that isn't that extraordinary about how they value customers etc. The thing that is extraordinary is that I get the feeling they really act as if they believed those sentiments. That is very rare in my experience. (view image and zoom to make the text easier to read).