Walk eastward along the tram rails or take any tram (2 stops) or any bus (1 stop).
Walking or using bus, turn right at the post office; as well as you pass the "dm market" building, you will see the cubic three-floor building of the refectory.
Getting off the tram, turn immediately right.
Then turn right to the cubic three-floor building of the refectory that you can see in the picture.