This is so absurd to me how can anyone disallow painting and drilling into walls of an apartment, I’m very glad that tenancy laws here basically say that if you rent a place you can do whatever you want with it, as long as reasonably it’s restore-able.
For a lot of the younger folks in the EU if your rental contract tells you you can’t do something it’s probably bullshit. And even if it isn’t at worst you’ll lose your deposit.