Codaisseur is based in Tripolis Building 200, a.k.a. "ScaleUpDistrict" at Burgerweeshuispad 201, Amsterdam. (When you're standing in the courtyard, look for the "200" sign above the entrance, or the ScaleUpDistrict logo on the front door).
The Triplosi Building is open Monday to Friday between 08:00h and 21:30h, and freely accessible from 08:00h to 17:30h. After 17:30h the entrance doors will go into "exit only" mode, and you need assistance from someone inside the building to open the doors for you.
Codaisseur's own floors are open between 09:00h and 18:00h, also depending on class schedules.