No special access issues
Fallbacka is most easily reached by car, but with a bit of extra walking can be accessed using public transport as well.
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From the direction of center, you'll first want to take Metro to Vuosaari. From Vuosaari, hop on to bus number 560 departing from Vuosaari bus stop H4571. Keep an eye out for Mustalahdentie (H4589) bus station to exit bus. From there, walk about 500 meters to Kallvikintie parking place, from which first sectors are just a few steps away.
Approach from north, the bus line 560 is still your best friend. The nearest bus station north from the boulders is Fallpakka (H4541), from which 650m walk along Fallpakantie and Kallvikintie will lead you to the parking place near first boulders.
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If you are making your approach by car, head for the parking place on the east side of Kallvikintie. The parking place is near a fenced area and is easily visible from the road. There is usually plenty of space to park here.
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From the parking place by Kallvikintie, the nearest sector is just around the fenced area. For the other sectors, follow the path/trails through the woods.