Went to Prague during the European heat wave at the end of June 2019. I travelled with a mixed group of guys mainly consisting of black men for my stag do. Prague is the stag capital of Europe because the beer is very cheap. The city is beautiful and old, and at night can give a very Gothic feel. The people are nice generally speaking. We went to a shooting range, took a private boat out along the Vltava river which was beautiful and course we enjoyed the nightlife - it was super surreal drinking rum and listing to grime in another country (the culture has gone clear!). The only problem we had was when some drunk local stuck his finger up at us for no reason... I think this was definitely a racial thing - I don't know what he was saying but i guess it was something along the lines of go back to your country. There are a lot of African immigrants in Prague so I can only image the type of treatment they get day to day. Overall I would recommend Prague to people of colour, but keep your wits about you when enjoying the night life - as you would anywhere - and you will be fine.