Well, you and Germany are one of the few influential western countries left that has some sort of stable center-left government. Almost everything else is rightwing conservative, neoliberal or slowly descending into fascism.
Spain has a left-wing government, Poland is back to being centrist after getting rid of PiS, Switzerland has its own distinct government where all major parties are represented in perpetuity, ...
Also to call the current German government "stable" is... a choice.
Poland isn't stable either. PiS may come back at any point. You'd think that consolidating power, destroying relations with all neighbours except for the totalitarian Hungary, and implementing a total abortion ban would do them in, but no. PiS can run a campaign entirely on anti-LGBT and anti-immigration rethoric and win. Poland turned into Florida every recent election. The anti-LGBT nonsense is already coming back ahead of the next presidential election.
> AfD is set up for a big win, so that will be that.
The AfD is currently polling at about 18% of the vote. Alarming, yes, but nobody wants to work with them. The next government will likely be CDU led, with either the SPD or the Greens as a junior partner.