Welp, the power is back on in our unit, but apparently not in the whole building. The entry buzzer is still out, the fire doors still won't stay open and the alarm on the fire panel has been beeping all day because it's still running on battery.

From all available evidence the boiler is still dark too. I guess that shower can wait a while longer.

Our radiator is now lukewarm instead of ice cold, also the beeping from the panel has stopped. Can it be that they've finished fixing the power? 🎉