From RING III:

Taking the "Ring III EAST" road, stay on Ring III until it becomes Itäväylä, and stay on Itäväylä until
you pass Itäkeskus shopping centre. 

As you pass Itäkeskus, move to the inside (right hand) lane, and take the Viikki slip road off to the 
right - about 400m past Itäkeskus. 

Stay on this road - Viikintie - through one set of lights, down the hill, across a set of tram tracks, 
through another set of lights, and turn right at the first set of lights which has a right filter lane -
you will have passed The Brook on your right, about 200m before these lights. 

You are now on Tilanhoitajankaari; Drive approximately 400m, past the Alepa on your right and the Kupla 
on your left, and the entrance to The Brook is on your right - it should be signposted on match days.