Viseu is known for its welcoming locals, tranquil setting, and low crime rate. The city is well lit at night and locals are generally respectful towards women. Even as a solo female traveler, one can freely explore the city's historic sites, parks, and local eateries without any significant safety concerns. Public transportation is reliable and safe to use. However, like anywhere else, it's always good to follow common safety measures like not walking alone late at night in deserted areas.