I have zero knowledge on German politics. But I do wonder, if these same problems are plagues many (most) big cities (and even countries) in the west, including very liberal and high spending governments, how can we safely conclude it’s a conservative problem (or a liberal one)?
Well in this case it is a documented trail of defering needed maintenance with the argument of needing to safe money.
I did not argue that this is a outcome that can only happen to conservative governments. In fact I am convinced it is a fundamental problem of how politics work: you elect politicians to government for a limited period, so they often try to push off costs for which the ultimate prize will be paid to the next period, in which they may not be in government anymore.
But of course conservative governments tend to be more often part of that dynamic since austerity politics and conservatism often (although, not always) go hand in hand. Often the austerity has a smidgen of corruption as well, where government contracts that then need to be made (urgently! since maintenance was deferred!) often go to the politicians private friends. Free market for thee and not for me.
Another classic is to starve some working government/public institutions budget, only to then point at the mess and explain why this needs to privatized (coincidentally you know exactly the right guy to step in, what a surprise).
I am not saying that it is only conservative polticians that do that, but it tends to be a bit harder to do while e.g. demanding democratic socialist policy and strong public institutions.
How balanced the budget is isn't really a conservative vs liberal problem—that's more of an administration detail than an ideological distinction.