No special access issues
No access issues, but let's keep it that way!
The main area is located only ~20-30 m from the closest residential building, so keeping your voice low is absolutely critical. Being nice and greeting the onlookers & dog walkers goes a long way! During early spring the foliage hasn't really grown yet so the spot (especially the Keulakuva-boulder) is quite exposed. Later in spring and during the summer it is surprisingly well covered, and you can mostly be in peace.
Regarding the approach:
Due to the very suburban nature of the crag the access by car is ridiculously easy. Closest parking spot is under 100 m away, with a larger one pretty close by as well. At the closest and smaller parking spot, parking is free and allowed for 2 h between 9-17, and otherwise has no time limits.
Accessing the crag with public transport is also easy! Mellunmäki's bus station is 1.5 km away, with the metro station being a bit closer. Some busses can take you a lot closer, like 570, 572 and 587.