APR
While I am in agreement that APRs should be quoted,
I do think that they do lose an element of their validity when considered over a very short time frame.
For example, borrowing €100 today, but paying back €101 tomorrow. APR is 376%.
The APR effectively calculates the cost of borrowing where you repeat the transaction over and over for a year. Where borrowings are only ever going to be for a period significantly shorter than a year, then I'm not sure that the APR (while technically accurate) is quite as applicable.
I do agree that all costs should be factored into the APR calculation, else comparisons become very difficult.