All three mainline stations are located on Komsomolskaya Ploshchad, approximately 7km from the Radisson Slavyanskaya Hotel.
By taxi
It will take 20-30 minutes to reach the hotel by taxi, and cabs should not cost more than $25 if you are negotiating on arrival. You can also order a transfer with a driver to meet you off the train here.
By metro
Take the brown circle line from Komsomolskaya Metro Station (easily accessed from all three mainline stations) and travel anticlockwise five stops to Kievskaya, which is right next to the Radisson Slavyanskaya Hotel.