SVO train arrives at Belorusskiy rail station (Белорусский вокзал). Hilton Moscow Leningradskaya (I assume it's the one) is near the Leningradskiy rail station (Ленинградский вокзал) which is 3 miles (or 3 metro stations) away.
If you're not alone and arriving outside of peak hours, taking the taxi is a good idea as long as you're not overcharged.