Long story short - we had a chance to spend in Kiev couple of hours, during our latest flight Tbilisi - Kiev - New York city, after our flight was delayed for about 10 hours at Kiev's Borispol airport we decided to use these hours by exploring Kiev, instead of waiting at airport's transit area.
Out of the airport terminal at Borispol, there are buses taking passengers either to Kharkivksya or Vokzalnaya. The ticket prices are really cheap there. Since we didn't had any clue which station should we go, we asked just a bus going to the city center. We were taken to the Vokzalnaya from which we took a taxi and headed to the Khreshchatyk street to try some Ukrainian cuisine, see the Maidan square. At the end We did some metro ride to the Kharkiskaya station, from which we were taken back to the airport.
Despite harsh weather (end of December 2016) I really enjoyed Kiev and was surprised to see that city is not at all expensive (taxi's, metro and even meal on central street were under USD 10). Amazing. Kiev - I will come back for more, most probably during Summertime.