It is about 20 km from Belarus Station, the Moscow terminus for trains to/from Belarus (Minsk and Brest), Kaliningrad, Smolensk and international destinations including Vilnius, Warsaw, and Berlin, to the Katerina Park Hotel.
By taxi
Depending on the time of day, the journey by taxi will take from 30 to 50 minutes, but should not cost more than $30. If you prefer, you can pre-order a transfer with a driver to meet your train here.
By metro
Take the metro from Belorusskaya Metro Station, and travel south on the dark-green line two stops south to Tverskaya. Change there to the gray line from Chekhovskaya, and continue south nine stops to Prazhskaya, which is only five minutes' walk from the Katerina Park Hotel.