Never got told anything about the size of my apartment effecting costs. Perhaps only counts if on a complex?
Anyways here is a breakdown of a typical bill I get once a month (well they build up till you have 3 normally):-
Elevators : 3.45
Cleaning of Stairs : 4.00
Saving account : 5.00
Cleaning/ office staff : 5.00
Electricity : 7.00
Cheers