Unable to answer "Who is allowed to use this playground?" – Playground – osm.org/way/1246967126 via StreetComplete 61.0:

This park is part of a school. But, members of the general public are allowed to use the park outside of school days/hours.

Attached photo(s):
https://streetcomplete.app/p/276740.jpg

Unable to answer "Is this stop lit?" – Keskuskatu 16 (Bus Stop) – osm.org/node/6271091253 via StreetComplete 60.3:

I am not sure if this would be considered as lit or not, but the station is near a lamp post.

Attached photo(s):
https://streetcomplete.app/p/275923.jpg

Unable to answer "Is this stop lit?" – Keskuskatu 29 (Bus Stop) – osm.org/node/6271091252 via StreetComplete 60.3:

I wouldn't say this bus stop is lit, but dimly lit because of its enclosure and there is only a lamp post nearby as the nearest light source.

Attached photo(s):
https://streetcomplete.app/p/275926.jpg

Unable to answer "Is this still here?" – RK Partners Oy (Advertising Agency) – osm.org/node/9525903129 via StreetComplete 61.0:

I have went around this building several times, but I fail to see any Advertising Agencies. Maybe it moved or closed up shop? Either way, this building is now home for multiple shops, and some housing(?).

Attached photo(s):
https://streetcomplete.app/p/276763.jpg