City in the East Ukraine. Nicknamed as "First capital", cause it was the first capital of Ukrainian Soviet Republic - direct predecessor of modern Ukraine. Large and powerful city (commerce, education, industry, science), second city by population in Ukraine and 29th (by metropolitan area population) in Europe. Lots of places of interest (e.g. Freedom Square - 9th largest in a world, Gosprom building - formerly largest in Europe, plenty of antique buildings, etc).
I live in Kharkov and love it!