are prices still going down rapidly?
No they are not, as is shown by information from the sources which you post here but you do not link to.
Latest figures from the source which Milky himself uses (when it suits him):
city m/m q/q y/y
Katowice +6.79% +13.50% +17.25%
Kraków +0.23% +2.44% +6.57%
Poznań -0.13% +3.80% +5.74%
Warszawa +0.42% +5.03% +7.50%
Wrocław -0.10% +4.17% +1.57%
Trójmiasto +0.88% +2.01% +2.98%
All the figures below are positive unless stated otherwise:
localization m/m q/q y/y median
Polska 0.24% 2.62% 3.80% 96,143 €
dolnośląskie 0.09% 4.67% 0.77% 81,909 €
kujawsko-pomorskie 1.69% 4.55% 7.14% 56,279 €
lubelskie 0.00% 5.36% 5.36% 69,176 €
lubuskie 0.00% 2.94% 0.81% 41,036 €
łódzkie 2.25% 2.51% 4.01% 59,025 €
małopolskie 0.26% 3.60% 6.69% 97,572 €
mazowieckie 0.24% 3.78% 4.42% 117,533 €
opolskie 3.60% 6.33% 10.11% 60,734 €
podkarpackie -1.11% 0.82% 2.10% 62,610 €
podlaskie 0.00% -0.50% -2.90% 63,548 €
pomorskie 1.85% 0.00% 3.69% 85,590 €
śląskie 3.54% 10.84% 15.86% 54,872 €
świętokrzyskie 4.26% 1.57% - 63,079 €
warmińsko-mazurskie 3.38% 2.17% 5.05% 53,699 €
wielkopolskie 0.23% 1.14% 1.36% 76,060 €
zachodniopomorskie 3.09% -2.86% 3.09% 72,523 €
Source: tabelaofert.pl/real-estate-prices?locale=en