Unable to answer "How many cars can be charged here at the same time?" for osm.org/node/5207175448 via StreetComplete 53.3:

Could not find it

I think this was replaced by Kvääristö but I've not yet checked in person. https://www.myhelsinki.fi/fi/sy%C3%B6-ja-juo/ravintolat/kv%C3%A4%C3%A4rist%C3%B6

Add Ainoa, Sammonsilta 5, square in front of it and sports field next to the square.
https://www.ainoatapiola.fi/contact-information
https://asunnot.oikotie.fi/talo/sammonsilta-5-espoo/14635654

Unable to answer "What is the name of this place? (Memorial)" for osm.org/node/4246739140 via StreetComplete 33.2:

only bushes here

actually there is a statue, will check the position later

via StreetComplete 33.2

Street was diverted yesterday, see https://www.hel.fi/uutiset/fi/kaupunkiymparisto/muutoksia-kulkureitteihin-ja-pysakointiin-1805

Statue is being removed today.

I couldn't find this water pump

Mostly demolished now, only one short strand remains.