Smart for 1000 euros ?

Hi, since I start my training from August and therefore drive 60km a day, I thought about how to get to work as cheaply as possible. Since I only have a budget between 1000-1500 euros, the selection is limited. Now the choice between a small car with LPG or just a Smart Diesel remained with me. In the focus is definitely the Smart, because I would rather drive it than e.g. a Corsa. In the net there is already the Smart with 41 hp from 700 euros. Is it recommended to buy a smart with relatively high mileage or. What must one pay attention above all with this model? As I have heard the Diesel engines should be relatively robust. In addition, one saves itself also a lot, if one has an extra fine dust particle filter installed. How much would such a cost, if I get none of the one already installed? with friendly regards, Michi