Response from Jonathan:
No surprise for the cleaning, the elevator and the sofa-bed as everything is mentionned in the description of the flat. So please read well before asking for the flat !!
As for the comfort of the sofa-bed, nobody has ever complain but it's true it's an extra sleeping so it can't be as comfortable as a real bed.
As for the building, Paris is a city where most of the buildings are old and construct before 1900. That's the charm of the city, a city of history. So once again, no surprise !!