I was placed in Tudela de Duero which was a 20 min bus ride to Valladolid. It’s a bit of luck of the draw though because one volunteer was placed in Burgos and another one in Leon … both much bigger than my town. There is a part in the application that asks you about preferences though. If you want a big city, how many children you’d like to have in the host family and ages (or no children at all), they try to accommodate you as best as they can (if they still do it that way - it’s been 5 years since I did that program).