Yes. Twice, lovely city. The main square is huge and beautiful, but a combination of tacky 'brit' oriented bars in one corner and very expensive tourist traps. First went in 2014 and it was not really like that, but last went 2020 and it had changed a lot. Best bars are the cellar bars imho. Not always easy to spot and quite often the music / karaoke give it away. There's a museum under the central building in the main square which is cool.
My top tip is go around the back streets of old town as the better/cheaper eateries and bars are there. The old Jewish quarter (Kazimierz) is great as well (tram or walk) with a ton of tragic history. We visited Schindlers factory and didn't have enough left in the tank to do the auschwitz tour.
The castle is great too - go up the bell tower for a top view.
when then flew north to spend the next 5 days in Da Nang & Hoi An - the latter probably being my favourite place during the trip overall. Then got another flight further north to the capital, Hanoi, where the temp dropped to a much cooler 14 degrees. Couple days there, then took a three hour bus to Ha Long Bay to do a two night cruise (which coincided with the Lunar New Year celebrations, which was an experience in itself!) before heading back to Hanoi for 24 hours before we started the journey back to the UK. The journey itself was around 19 hours - two 8-ish hour flights back-to-back with a short layover in Qatar.
