Kursk Station, the Moscow terminal for trains from central Russia (Kursk and Nizhny Novgorod), eastern Ukraine (Donetsk and Kharkiv), and some Sapsan high-speed trains from St. Petersburg, is around 25 km from the Iris Congress Hotel by road.
By taxi
It should take just under an hour to reach the hotel by car, although the trip can be much longer during rush hour. If you are willing to negotiate with a driver on arrival, taxis should cost no more than $50. If you prefer, you can book a transfer with a driver to meet your train here.
By metro
Take the metro from Kurskaya Metro Station and on the brown circle line and go three stops counterclockwise to Novoslobodskaya. Change there to the grey line and head north four stops to Petrovsko-Razumskaya, which is 25 minutes' walk from the Iris Congress Hotel. You can also take bus number 656 from the metro station directly to the hotel.