Take the CHUO line rapid or regular from Shinjuku and get off at Kichijoji. Ince you are off, make sure you exit the south Koen exit, its about a 2 minute walk.
Look at the map below they are circled, both locations k-skit and laavenue.jp.
Look for a triangle encased with a circle, that is where you are on the map once you get off the south Koen exit.