The Smile Coffee shop is well located close to the BTS and a well known lunch time coffee shop in the Prakanong District of Bangkok. They have free WiFi and the pricing is very reasonable. There is both indoor and outdoor seating and the decor has been done well.
This is one of a few good coffeeshops in the area and well worth a visit. Other coffee shops in the area are Cafe Amazon and the M Coffee and Bakery. See the map below for its location and a few photos from users who have also used this coffee shop before.