Which is the nearest metro station?

It's a five-minute walk from the hotel to Paveletskaya. This is where the brown circle line meets the dark-green line. From there it is just one stop to the Tretyakov Gallery and two stops to Red Square and the Kremlin. To reach the station, turn left out of the hotel, take the second left onto Zatsepskiy Val Street Street and walk down the street for about 400 m and the metro will be on the right.