I spent a week in Warsaw in 2020 (right before the world shut down, to a point where it was not 100% clear I'd be let back in the US), and thought it was an extremely underrated city. As you said, very clean and walkable, and as an American it's really cheap due to the exchange rate.
I go to Poland nearly every year because of Lambda Days, which is in Krakow, though next time I fly over I might take the train over to Warsaw again.
I go to Poland nearly every year because of Lambda Days, which is in Krakow, though next time I fly over I might take the train over to Warsaw again.