I think the only place in Leszno worth worrying about is the market square and its surroundings. However, there's not much crime anyway. Homeless people can be found at the train and bus stations, but they don't cause any major problems. It can be more dangerous at the speedway race in Leszno. Because of the fans

Poland is actually really safe for all women when I came here for the first time it was not like my home country you can walk alone at night you can also not worry about being robbed because it’s really safe in here