Really enjoyed our stay at the Crown Plaza, which was a bolt on to the end of a wider Finland trip, and spent a few days in Helsinki.
Hotel was great - nice spacious rooms (for family of 3) and really good gym/pool facilities which we utilised. Staff friendly and help and we had breakfast there, which again, was a really good selection from cold meats and cereals, through to hot buffet. We looked ahead via Hotels.com which ended up a lot cheaper than buying on arrival.
We have toyed with the location prior to the visit ie do we go for the Radisson by the station or here - in reality, it was a 15min walk from the main training station but once we found the tram maps etc, it was a 2 min walk in either direction (plus is also similar walk to metro station) and when having a day public transport pass, the location was super central and convenient. Same with the airport, as we had a day pass, it meant we could tram to the station, and then pick up the I or P train straight to airport, all on the same pass.
It's right next to the park, so was able to enjoy a lovely run around the lake & olympic stadium, and is clearly marked out for runners/walkers too.
Little tip would be to sign up for the IHG prior to arrival, and I had it historically from work, but it just enabled some benefits like early check-in which was really useful for us.
We definitely recommend the hotel to other families or couples looking for a stay in Helsinki.