Affordable car for commuters 100km a day

Hello together, I will soon start a new job in a city about 50km away and need a car for it. It should be as economical as possible, because the frequent driving already beats well enough on the cash register. Budget would be up to approx. 750€(+/-), my requirements are quite sufficient, only a bit more storage space than a small car like e.g. a VW Up it should already have and as far as possible be a 5-door, so that I can use it well in the summer of everyday life. I assume that there is a used person, but not all too old, but I’d like to be taught by you professionals. I hope you can give me one or the other tip, I’m grateful for any new information I can get.