sounds like it is an open secret that every regular customer would know. They understand in advance that they are giving it to you for 2 weeks.
The only question might be that you would otherwise have it for 2 weeks and pay them more, so you are depriving them of livelihood. It sounds like absent this opportunity, you would pay for the week and use for the week, right? Then, they have no loss and you an extra convenience. Of course, it is a slippery slope to convince yourself that you really need 1 week, but in this case, you actually did it already.