The street address of Nightingale Nest is:
Mannerheimintie 164A, 2nd floor
00300 Helsinki
Are you planning to come by car?
There is an Aimo Park underground parking garage available on-site. You can get to Nightingale Nest using the elevator or staircase directly from the garage. Just search for "Aimo Park Tilkka" and you will get directions to the parking garage.
There is also street parking available nearby Nightingale Nest.