Kiev Station is the Moscow terminal for trains to/from Kiev and several other European cities including Belgrade, Zagreb, Bucharest, Budapest, Prague, Vienna, and Venice. It is a little less than 6 km away from the hotel.
By taxi
The drive to the Marriott Tverskaya Hotel should not take more than 20 minutes, and taxis at the station can be negotiated for around $20. It is also possible to order a transfer with a driver to meet your train here.
By metro
From Kievskaya Metro Station (accessed from the mainline station concourse) travel clockwise on the brown circle line two stops to Belorusskaya, which is roughly five minutes' walk from the Marriott Tverskaya Hotel.
