Astrek in located in Thamel in the heart of the tourist section of town. The ASTREK Climbing Wall is 15 meters high with two climbing surfaces in an L-Shape. Although the climbing wall is covered, it is an open air gym.
Climbing costs 250 NR for an all day entry. You can rent equipment there for about 200 NR.
There is a bouldering wall inside as well as a bar and a cafe.
Directions in Kathmandu are always relative since very few streets have names. It is located by the Belgian Consulate. Otherwise check out the attached maps to help you find them.