@pettter Here I am absolutely sure they would be very happy to still collect the keyes on the 15th and start renowating this place as long as we have paid the rent for the whole month. I am sure that would not be a problem at all.
I however will be turning this living room to a very expensive furniture painting area for the latter part of the month and keeping the keys all the way to the moving day. But I know many would not.
In the Finnish discourse landlords are seen as a very positive part of the system, sadly. Even the social security system is in some ways built around protecting them by ensuring rent payments first. This can be called protecting people from being homeless, but it isn't just that.