I believe this café is relatively new but it is already phenomenally popular, mainly with locals. Situated beside Nong Prajak Park it is a good location with really pleasant interior and exterior seating areas, including comfy chairs and sofas. It is far and away the nicest cafe I've found to sit in in Udon.
Coffee is well above average for Thailand and as good as I've had anywhere in Udon, similar quality to the Bookhouse, better than anywhere else I've tried. At 40B for a cappuccino/latte/mocha it is also very good value. Cakes range from about 45B to 85B and are tasty. Presentation is very good, even the 45B brownie will come served on a plate with chocolate sauce and cream.
Wifi is fast and reliable even when the place is packed. Service is friendly. Fantastic place overall.